Consider following MWE:
\documentclass{article}
\usepackage{blindtext}
\usepackage[colorinlistoftodos,prependcaption,textsize=tiny]{todonotes}
\presetkeys%
{todonotes}%
{inline,backgroundcolor=yellow,textcolor=blue!20!white}{}
\begin{document}
\blindtext\todo{Is this text in blue?}
\end{document}
How can I specify globally the textcolor of my todonotes?