[Inkscape-user] "Crayon" color picker

This may be semi-off-topic, but if anyone has an answer for me, it may be the diverse group that uses Inkscape. My primary OS is Mac OS X, although I spend a lot of time in Linux and Windows. One feature in OS X that I just love for some reason is the "crayon" color picker. Does anyone know of anything similar to this that is available for Linux and/or Windows?