My first real project since the beginning of my learning is to do a Platformer with a RPG dimension. Here's the first draft : 

https://kthulhu1947.itch.io/pixel-and-platform

The tiles size is 32x32 pixels. It's some mud and grass. For each kind of tile, there are 3 different variations to break the monotony ;-)

Hope you'll enjoy it.

You're free to use and modify it as you wish.