What can I replace electrical outlet covers with?
You can purchase a solid cover, same size. Or if it's sheetrock you can put a patch in place, mud around it, and sand or wet sponge smooth. Then paint.
I think they really cheap. Easy to install.
You can't cover electrical outlets if they a live. That is against code and a fire hazard.
Yes if wires are still in there you cannot use drywall. Must use a blank cover.