Just the symbol:
\documentclass[tikz]{standalone}
\begin{document}
\begin{tikzpicture}[y=0.08em,x=0.08em,xscale=0.25,yscale=-0.25, inner sep=0pt, outer sep=0pt]
\path[fill=black,even odd rule] (487.6550,288.9690) .. controls (489.0610,278.5690) and
(489.8700,267.9960) .. (489.8700,257.2330) .. controls (489.8700,128.0770) and
(384.5990,23.3610) .. (254.7670,23.3610) .. controls (241.8630,23.3610) and
(229.2120,24.4210) .. (216.9010,26.4410) .. controls (194.8280,12.0570) and
(168.5590,3.6740) .. (140.2880,3.6740) .. controls (62.7660,3.6740) and
(0.0000,66.4820) .. (0.0000,143.9800) .. controls (0.0000,172.1780) and
(8.2990,198.3740) .. (22.5900,220.3690) .. controls (20.6650,232.3860) and
(19.6810,244.6920) .. (19.6810,257.2290) .. controls (19.6810,386.4050) and
(124.8980,491.1100) .. (254.7660,491.1100) .. controls (269.4230,491.1100) and
(283.6930,489.6840) .. (297.5620,487.1780) .. controls (319.1120,500.5470) and
(344.4960,508.3260) .. (371.7080,508.3260) .. controls (449.2100,508.3260) and
(512.0010,445.5020) .. (512.0010,368.0120) .. controls (511.9980,338.7190) and
(503.0410,311.4840) .. (487.6550,288.9690) -- cycle(276.7400,429.5960) ..
controls (202.0340,433.4870) and (167.0750,416.9590) .. (135.0500,386.9050) ..
controls (99.2850,353.3370) and (113.6520,315.0500) .. (142.7900,313.1040) ..
controls (171.9120,311.1590) and (189.3980,346.1160) .. (204.9410,355.8400) ..
controls (220.4650,365.5280) and (279.5340,387.6000) .. (310.7350,351.9320) ..
controls (344.7100,313.1040) and (288.1410,293.0120) .. (246.6760,286.9300) ..
controls (187.4730,278.1640) and (112.7260,246.1370) .. (118.5410,183.0230) ..
controls (124.3580,119.9490) and (172.1230,87.6090) .. (222.3910,83.0470) ..
controls (286.4680,77.2300) and (328.1820,92.7540) .. (361.1760,120.9070) ..
controls (399.3270,153.4360) and (378.6840,189.8010) .. (354.3770,192.7270) ..
controls (330.1660,195.6360) and (302.9730,139.2230) .. (249.5860,138.3750) ..
controls (194.5590,137.5110) and (157.3690,195.6360) .. (225.3000,212.1590) ..
controls (293.2660,228.6640) and (366.0500,235.4450) .. (392.2610,297.5760) ..
controls (418.4900,359.7130) and (351.5070,425.7010) .. (276.7400,429.5960) --
cycle;
\end{tikzpicture}
\end{document}

Now embedded in to the CV:
\documentclass{moderncv}
\moderncvstyle{casual}
\moderncvcolor{blue}
\setlength{\hintscolumnwidth}{3cm}
\setlength{\makecvtitlenamewidth}{10cm}
\firstname{\textsc{S}} % Your first name
\familyname{\textsc{K}} % Your last name
\newcommand*{\skypesymbol} {%
\protect\raisebox{-0.085em}{%
\protect\begin{tikzpicture}[y=0.08em,x=0.08em,xscale=0.022,yscale=-0.022, inner sep=0pt, outer sep=0pt]
\protect\path[fill=color2,even odd rule] (487.6550,288.9690) .. controls (489.0610,278.5690) and
(489.8700,267.9960) .. (489.8700,257.2330) .. controls (489.8700,128.0770) and
(384.5990,23.3610) .. (254.7670,23.3610) .. controls (241.8630,23.3610) and
(229.2120,24.4210) .. (216.9010,26.4410) .. controls (194.8280,12.0570) and
(168.5590,3.6740) .. (140.2880,3.6740) .. controls (62.7660,3.6740) and
(0.0000,66.4820) .. (0.0000,143.9800) .. controls (0.0000,172.1780) and
(8.2990,198.3740) .. (22.5900,220.3690) .. controls (20.6650,232.3860) and
(19.6810,244.6920) .. (19.6810,257.2290) .. controls (19.6810,386.4050) and
(124.8980,491.1100) .. (254.7660,491.1100) .. controls (269.4230,491.1100) and
(283.6930,489.6840) .. (297.5620,487.1780) .. controls (319.1120,500.5470) and
(344.4960,508.3260) .. (371.7080,508.3260) .. controls (449.2100,508.3260) and
(512.0010,445.5020) .. (512.0010,368.0120) .. controls (511.9980,338.7190) and
(503.0410,311.4840) .. (487.6550,288.9690) -- cycle(276.7400,429.5960) ..
controls (202.0340,433.4870) and (167.0750,416.9590) .. (135.0500,386.9050) ..
controls (99.2850,353.3370) and (113.6520,315.0500) .. (142.7900,313.1040) ..
controls (171.9120,311.1590) and (189.3980,346.1160) .. (204.9410,355.8400) ..
controls (220.4650,365.5280) and (279.5340,387.6000) .. (310.7350,351.9320) ..
controls (344.7100,313.1040) and (288.1410,293.0120) .. (246.6760,286.9300) ..
controls (187.4730,278.1640) and (112.7260,246.1370) .. (118.5410,183.0230) ..
controls (124.3580,119.9490) and (172.1230,87.6090) .. (222.3910,83.0470) ..
controls (286.4680,77.2300) and (328.1820,92.7540) .. (361.1760,120.9070) ..
controls (399.3270,153.4360) and (378.6840,189.8010) .. (354.3770,192.7270) ..
controls (330.1660,195.6360) and (302.9730,139.2230) .. (249.5860,138.3750) ..
controls (194.5590,137.5110) and (157.3690,195.6360) .. (225.3000,212.1590) ..
controls (293.2660,228.6640) and (366.0500,235.4450) .. (392.2610,297.5760) ..
controls (418.4900,359.7130) and (351.5070,425.7010) .. (276.7400,429.5960) --
cycle;
\protect\end{tikzpicture}}%
~}
\makeatletter
% defines one's email (optional)
% usage: \email{<email adress>}
\newcommand*{\skype}[1]{\def\@skype{#1}}
\renewcommand*{\makecvfooter}{%
\setlength{\footerwidth}{0.8\textwidth}%
\fancypagestyle{plain}{%
\fancyfoot[c]{%
\parbox[b]{\footerwidth}{%
\centering%
\color{color2}\addressfont%
\vspace{\baselineskip}% forces a white line to ensure space between main text and footer (as footer height can't be known in advance)
\ifthenelse{\isundefined{\@addressstreet}}{}{\addtofooter[]{\addresssymbol\@addressstreet}%
\ifthenelse{\equal{\@addresscity}{}}{}{\addtofooter[~--~]{\@addresscity}}% if \addresstreet is defined, \addresscity and \addresscountry will always be defined but could be empty
\ifthenelse{\equal{\@addresscountry}{}}{}{\addtofooter[~--~]{\@addresscountry}}%
\flushfooter\@firstfooterelementtrue\\}%
\collectionloop{phones}{% the key holds the phone type (=symbol command prefix), the item holds the number
\addtofooter{\csname\collectionloopkey phonesymbol\endcsname\collectionloopitem}}%
\ifthenelse{\isundefined{\@email}}{}{\addtofooter{\emailsymbol\emaillink{\@email}}}%
\ifthenelse{\isundefined{\@homepage}}{}{\addtofooter{\homepagesymbol\httplink{\@homepage}}}%
\ifthenelse{\isundefined{\@skype}}{}{\addtofooter{\skypesymbol\@skype}}%
\collectionloop{socials}{% the key holds the social type (=symbol command prefix), the item holds the link
\addtofooter{\csname\collectionloopkey socialsymbol\endcsname\collectionloopitem}}%
\ifthenelse{\isundefined{\@extrainfo}}{}{\addtofooter{\@extrainfo}}%
\ifthenelse{\lengthtest{\footerboxwidth=0pt}}{}{\flushfooter}% the lengthtest is required to avoid flushing an empty footer, which could cause a blank line due to the \\ after the address, if no other personal info is used
}}}%
\pagestyle{plain}}
\makeatother
\address{}{}
\mobile{(+00 000) 0000}
\phone{(+00 00) 0000}
\fax{(000) 111 1113}
\skype{SK}
\email{[email protected]}
\begin{document}
\makecvtitle
\end{document}
