In Usus Elementi you've got a 10x10 isometric grid made of blocks. You can use the four elements (Fire, Water, Earth, Wind) on that blocks (called "Grassland" Blocks) to create new environment blocks, like Savannah, Jungle, Woods and others.
One of ther first screenshots ever taken. *Nostalgia*. There were no hud, no background, and the grid was 5x5.