Below is how far I got and as you can see I've got plenty of blue squares, OK on green, orange, some pink, not much red, purple or yellow. This was just going through my box of scraps and what I got from Angelcat ( ;-) Thanks) in a scrap swap we participated in this past fall. I now need to go through my boxes of fabric to try and expand the range of colours, but I suspect I will have to go shopping for some more yellows. The other colours that I still have to start cutting are the black and white blocks.
Below is a shot of Cathy Tomm's "Luminous Diamonds" Quilt and a detailed view. I really like how these squares eventually turn into these diamond shapes. I'm not to sure about the zig zag border, but then what else you would do? She calls her background a "scrappy" background, but in the instructions you could also make it all in tones of one colour.