I just finished the top of a 6'x6' quilt, with bright orange, yellow, blue, green, and a flower patten with all those colors and alone the colors are bright, but put together I think it looks fun. As I was putting it together, I thought it looked horrible, but once I was finished I was pleased with it.
I bet once you put it all together it will look really good. Its just the computer that makes it look like a potholder
And it will probably take less time if you do the black pieces as one whole block.