Apologies for butting in but, many people aren't up to making full tilesets, especially solo or for shorter jam game-esque projects. Making yours public wouldn't "make everything all looks the same" but instead increase variety overall.
Most of the following response is general advice to all devs who see this, not just to Muffyang.
(Will be posted in several posts due to character length)
"many people aren't up to making full tilesets"
If you're "up for" making a fan game at all, then you're "up for" making your own tilesets. If you want to make a game, you need to be able to do the bare minimum of putting together your own tilesets. Don't be lazy.
"especially solo"
I did it solo, so you can too! I promise it is not that hard.
This does not mean you need to make every tile from scratch, that's definitely not what I did. It is as simple as picking tiles from public resources and curating your own set of tiles. Editing tiles and their colors as needed. When tiles that you need don't exist, it's a great opportunity to make your own.