How much does it cost to make them and do you need a gold account? I'm sorry if this is already explained somewhere, i looked around and couldn't find any answers.

Anywhere from 2k CSC to 5k CSC for backgrounds. The prices vary according to size, backgrounds naturally being the most expensive.

And no, you don't need a GA. c:

Anything else?

That would be all, thank you =)

Certainly. c: