Here are some StarCraft maps I've created with my DOS program SCLABGEN. The program generates labyrinths with only one possible way to walk between any two positions in the labyrinth. Maps like these are impossible to create with StarEdit, Blizzards standard map editing tool.

Amazing Turret Defence 1.0	Amazing Turret Defence 1.0.scx This is the original ATD that started it all.	64x64	200 KB
	(5)Labyrinth.scm	256x256	92 KB
	(6)Labyrinth.scm	256x256	88 KB
	(7)Labyrinth.scm	256x256	89 KB

These are two maps created with StarEdit. Great for long games.