Edit: There's now a calico version (both a large and small one) if anyone wants to use that.
This is what I originally was going to have as my icon (in the grey cat colors I typically use, not the black you see now), but I lost the file. Well, I found it again just last night, and I thought people might appreciate it as a free icon, since it was already done.
I only have three colors/patterns as of right now, but I might do up a few more (like a tabby or calico pattern) a little later.
There is no need to ask for permission to use any of these; they are completely free for anyone to use (you can find the only other large one, a calico, here: [link]