You might consider the X's and O's pattern. I did mine in two colors, but it would look quite good in 10 different fabrics. The white would make your fabrics really stand out.
http://quiltingtutorials.com/wp-cont...02-29-2012.pdf
It doesn't use HST though. It uses sort of half snowballs. It is pretty easy, just lots of repetition.
Dina