color theme: like say green theme, red theme or 2 colors in 1 like: red and blue theme and etc.
Nature theme: Showing people their Nature
Cartoon theme: Gotta give cartoons some love
80's/90s theme: Give people some nostalgia with a couple of neon vibes

This is most of my theme suggestions

color theme

VIdeo Game theme.

I've seen a million "Retro/Vapor/ETC Wave" profiles could let them battle it out one month to see which one is the best. I think they shouldn't get too specific or obscure, having color themed contest, or anime, nature all sounds perfect. But if you pick something too specific you might have trouble finding 5 that fit or just end up handing the contest to the 1 guy who has a clearly higher quality profile in that theme.

PS: What I think the community needs more so than themes for the contest is more interaction! The whole staff team is pretty much silent, I never see any of you guys interact with threads or creating new ones. Having threads like this helps open up conversation and I'd like to see more of that energy, as it stands the members of the community don't really interact with each other and I'd love to see something be done about that. You could have some of the contest be for interactive members only (make them respond to 10 threads, make at least 1 that gets 10 replies) something along those lines to encourage more community engagement. At the end of the day I love this community and am grateful to be apart of it, but I think there are things that need work and attention, I was genuinely excited when I thought there was gonna be a mod picked who was gonna be someone who's active like RAMT or Mercer but then time goes by and it never happened now the comment 4 comment, like begging garbage is making it's way into general discussions, there's like 4 people who actively engage with the community and most contest I see 5 people in who I don't even know lol.

PPS: Just food for though I still got big love for ya'll I just wanna see things do better.

Synthwave Theme

Space'y theme sign me up :D

How about themes that specify a game/anime/show only just 1 game/anime/show

Like example:
Touhou theme
Undertale theme
Persona theme
Minecraft theme
Gta theme
Breaking Bad theme
Better Call saul theme
Spongebob theme
Any other theme from a Game, show or anime

animeeeee

Color theme?

Nothing personal: Anime and vaporwave themes are so overdone feels like there isn't anything to uniquely do anymore.

-̶̬̼͓̃͛̈́͑̃̽̔⁧⎠-̷ Cyberpunk theme

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pixel

I think color scheme is good! Black/White theme, purple, pink, blue, etc.

Gives people to a chance to look at others peoples profile for inspiration and give ideas to better their profile!

Game theme:
ex. CSGO, Dota, Sons of the Forest, Stardew Valley, etc