would any of these look good? or should I use color?

I kinda like the top right. It makes the blocks float a little better and gives the eye a place to rest. And it's dark enough to make the blocks stand out. I love your kitties!

I like the checks.

I much prefer the top left fabric
My 2nd choice would be the checked one.

checks

I like the checks.

at first i liked the top right the best, then after looking a few times I really liked the bottom right/large check as much if not better. Lots of help huh. But I'm not voting for either on the left hand side as you look at the pic.
Good luck I'm sure you'll make the right choice can't wait to see it finished.

I say top right or bottom left

Very cute and I like the checked also

I really like the top right, it is perfect for showing off your darling cats!