Here's a few good places on colorLovers for finding palettes to play off of:

Two color palettes:

• Two's Company game in the Take One Color Pass It Down group


• The Two Colors group
  

Three Color Palettes

• Three's A Crowd game in the Take One Color Pass It Down group


• The Three Colors group
  

Four Color Palettes

• Four To Go game in the Take On Color Pass It Down Group


• The Four Colors group

Another source are those individuals who are members of the Two, Three and Four color palettes groups, such as myself, who regularly experiment with the smaller number colors. If you visit one of the groups and select one of the Nest members and check out their palettes, you should be able to have several interesting choices. I know some of us mark our smaller palettes with tags indicating color number, so visiting these Lovers' pages and performing a search for 'two', etc. might yield some inspiration.

Anyone else have any good ideas for sources of palettes to play off of?

Awesome! Thanks for this post. :)