We have received confirmation from randomize that backgrounds are NOT allowed; however, he WILL be adding a category specifically for backgrounds in the future.
"he WILL be adding a category specifically for backgrounds in the future. " I remember how long it said "shops coming soon" .... so don't count on it happening any time soon.
I'm not saying Randomize chooses to not update these things in a timely manner. He obviously has a lot on his plate. Just saying, just because he says he'll be adding somthing doesn't mean it will happen soon.
I'm actually happy about this!! Some were good, but they got excessive, and the ones where it was just one other colour blended in were simply needless. :)