I had this problem to, Do you have a picture of your own? Or are you doing a search on the web? I didnt have any of my own so I went into www.google.com then I clicked images and did a search . I clicked advanced search, and I did a search on black cats. I limited the search to an icon size photo (you have to click advanced search to do this) I found a cat that could be lilly because it looks identical, and I loaded it into the avator place.
Let me know if you can get it ok.