I would love to make videogames for a living, if it wasn't so much work! I'd settle for "if I didn't have to do all the art myself", but I'm told that's setting the bar too high. Anyway, here are some games I want to make.
1. A Greek mythology game. It'd be great to have an adventure game, where you play as the Greek gods. In addition to traditional actions like "pick up item", you could have godly actions like "hurl thunderbolt at mortals". I'd play a game like that!
Alternately, I could go the educational route, and make a game that tells the basic Greek myths, which occasional, simple puzzles. Something like The Adventures of Hercules, where you play through all twelve of his big adventures.
2. Pluto's Quest to Be a Planet. I thought up this title, but I have no idea what it'd be like.
3. A fantasy football game, done in the style of Sakura Wars. I think this may be one of those ideas that sounds great in my head, but wouldn't be very great in real life.