The easiest way to go might be to simply design your own quilt. A spreadsheet is an instant quilt, just fill in the 'cells'. You could even add and subtract colors in any manner/pattern you choose...for example, red + blue = purple.
If broadening your options, you could also consider any of the math quilts.
http://www.mathematicalquilts.com/
Whatever you decide on, don't forget to use Bottom Line thread!
