id be doing these contests Rui if my world edit hadnt jacked up on me. Now everytime i move a doodad it resets the height on me. Plus the lack of creativity for each tileset was a pain. Maybe have a set theme to work around each time.
Like go through the tilesets and have a list of different themes (Castle, wasteland, river, waterfall, village, fantasy, abstract) and each person uses those themes toward each tilseet. But you can only use one and you cant reuse one. Just a suggestion, i know it was a pain thinking of something interesting to terrain for each of these