I agree with the others, you really need to find out what color/s they like. To satisfy my own curiosity, I did a search and came up with these.
with a little blue: http://filminthefridge.com/2009/08/0...-string-quilt/
with a little yellow: http://willknitformath.blogspot.com/...-festival.html
with gray: http://www.pinterest.com/pin/183943966002696649/

I also found this one made by Yvonne here on QB. You could use really light pastels (just a blush of color) instead of her medium color fabrics.
http://www.quiltingboard.com/picture...op-t43349.html

Good luck and let us know what you decide!