Microsoft Design Gallery Live:
http://dgl.microsoft.com/
Barry's Clipaart Server:
http://www.barrysclipart.com/
HTML color picker:
http://www.pagetutor.com/pagetutor/makapage/picker/
RGB Triplet Color Chart:
http://quasar.unl.edu/tutorials/rgb.html
Color Blender:
http://www.meyerweb.com/eric/tools/color-blend/
Color Schemer Online:
http://www.colorschemer.com/online.html