To add one detail to @Sebastiano's creative solution, making the cloud fill and the tcolorbox frame and background all the same colour perhaps gives the cloud a more 'cloudy' feel.

MWE
\documentclass[a4paper,12pt]{article}
\usepackage{tikz}
\usetikzlibrary{shapes.symbols}
\usepackage{tcolorbox}
\tcbuselibrary{skins}
\usepackage{lipsum}
\begin{document}
\begin{center}
\begin{tikzpicture}
\node (a) [draw,cloud,cloud puffs=15, aspect=2.5, cloud puff arc=120,inner sep = 0pt,fill=blue!10,text width=14em,text height=2ex] {%
\begin{tcolorbox}[fonttitle=\bfseries\large,coltitle=black,colbacktitle=blue!10,title=Title Text,colframe=blue!10,colback=blue!10,width=12em]
An idea goes here \ldots
\end{tcolorbox}
};
\end{tikzpicture}
\bigskip
\begin{tikzpicture}
\node (a) [draw,cloud,cloud puffs=15, aspect=2.5, cloud puff arc=120,inner sep = 0pt,fill=blue!10,text width=14em,text height=2ex] {%
\begin{tcolorbox}[fonttitle=\bfseries\large,coltitle=black,colbacktitle=blue!15,title=Title Text,colframe=blue!30,colback=blue!20,width=12em]
An idea goes here \ldots
\end{tcolorbox}
};
\end{tikzpicture}
\end{center}
\end{document}
frame code=<tikz drawing code>
option.muzimuzhi Z
suggestion you solved the issue, if not so, can you show a image of your requirement, sorry it is not clear for me....tcolorbox
does "an accentuated colored text box with rounded corners" (manual, p 12), the core code being a bunch of\pgfpathlineto
s with (adjustable) arcs on the ends. A TikZ cloud node with some rectangular nodes emulating atcolorbox
might work.