For any purpose actually: building a scenary for a RPG or whatever game, background, 2D side view/top view/top down view games, ...
If you don't like that or not confortable with, it's a good opportunity to improve your skillset.
You can start by simple things, looks for 2D dungeons for instance or dungeons/castle assets for RPG or map.
It would be nice to have matching assets to yours cause mismatch of styles always looks weird or even worth.