If I had to pick a favorite all-over design then this would definitely be it:
I love how it just blends in on any type of fabric. I have used it on a quilt with bicycles all over it and I have used it on a quilt with flowers. I also love how it fill in all the spaces and give a uniform density to the quilt. I have to watch myself though, I tend to use it too much!
Here is a shot of the front of the quilt: