Why dont you go with slate?, it has traction for your gecko and it looks 'natural'. Cheap to :main_thumbsup:....ceramic can result in them sliding everywhere
Just look for something with a rough surface. I bought porcelain, but it isn't glazed or coated with gloss. It's a little rough and my leo seems to be doing fine walking around. Keep in mind that porcelain is harder to cut than other tiles, however.