2025-May-25: I’ve enabled the Tangerine UI Themes at hear-me.social. They look great. My personal favorite is “lagoon” but the default tangerine, cherry, and grape are very nice too.

There’s more information here: https://github.com/nileane/TangerineUI-for-Mastodon

To enable, just go to Preferences->Appearance->Site Theme, and pick the look you’d like to use from the dropdown.