Hello there !
So you have in front of you my first attempt of tiles, each of them measures 32 pixels by 32 pixels.
I'm quite satisfied with the rendering especially for the dirt.
The trick to remember, for making tiles, is to use colors very close to each other to create a kind of blur/noise, because the goal is not to attract the player's attention on the tiles, and make interactive elements, like monsters or chests, stand out more than the background.
I talk about player but I didn't make these tiles for a game, just to practice, because if it was for a game, I would have done it differently. For a game the best is to make all tiles in blueprints or rough first.
Made on Aseprite using its "Tiled Mode" feature, that you can find in the "View" tab.
Thank you for your visit and for your time. See you soon !