My attempt at making a tile based game where the game was also the editor.  Clearly I didn't know what I was doing, but like many things I've done, it was a good learning experience.  I made a few screens from Link's Awakening with it.  I was drawing each tile in MS Paint by staring intently at my Game Boy, so that was a mix of both tedious and fun.
	
		
	
				
				
		
		
					
			
				
		
		
					
			
The editor interface and first screen of Link's Awakening.

Second screen of Link's Awakening.

I created a splash screen for the About window with the alternate name of MyCraft.  Clearly this is a totally original image.  Not ripped off of any retail game or anything.