Press 1 to switch between block and air. Press 2 to switch/rotate small corners. Press 3 for half block/quarter block with corner. Press 4 to switch/rotate big corners. Press 5 to change the color to white/black/gray. Press S to save with save code. (Put it in a document) Press L to load with save code. (Copy it from a document)
This took about 8 hours... I have made this for a game I am currently making!