Now that you've selected your 9-patch on the grid, pick a painted roving (oh, c'mon...you've got to have at least ONE in your stash) or 3 different colors of dyed roving (or top). White, gray or black can't count as one of the 3 colors because we'll be using them for something else later on.
Next, pick a complementary color to one of the 3 colors you've chosen. A complementary color is the color directly across the color wheel (ie red and green). Then check to see if you have a little gray, white and/or black roving for your palette.