I'm inspired by really good puzzle type games like Tetris despite never successfully making one. But they inspire me to fail at the effort nonetheless.
And big grand sweeping RPG games too. I got really far on one in RPGMaker 2 for PS@, but ran out of memory and got too depressed to try and make it work. I'm hoping to remake it for Construct 2 despite the issues I already foresee (2D vs 3D, and my own inability to be clever with arrays, and that sort of thing).