With regards to themes: making new themes is something we've discussed, but hasn't been at the top of the priority list as of yet.
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Will there be themes for other series?
This is something we haven't thought of, mainly because our branding is as a One Piece forum. I think if we release other themes they'll be One Piece related to begin with, but we'll see. It's mainly up to our designers
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-Banner making contests?
I'd be up for this, actually - saves me having to contact DA artists at the very least, hahaha