Vocaloid Color Palettes
Bah a bit of shameless advertising here but I thought i'd share my color palette blog with you guys : http://vocaloidcolorpalette.tumblr.com/
Bit of a derp when it comes to searching for them because of how Tumblr is set out but finding them should be fine.
I don't update regulary since i'm the only one who ever does palettes regardless of allowing others to submit palettes, but you are free to request them. Not too strict on requests so long as Vocaloids are involved in the request.