Probably an image board on https://minesats.gg/ where users can get tips on their pictures.

I will have to decide how I want to implement the wallets for tipping and receiving tips.

I think I will do this like nostr: Just enter an LN address in your profile and every tip will go straight to the user. True P2P.
No involvement by me except hosting of the images.

I will may ask for a small fee before uploading though.