That old Android phone you have lying around from when you upgraded is actually a lot more capable than you think. In fact, by connecting it to your TV and using a couple of cheap Bluetooth controllers, you can turn it into a retro gaming console with all the Nintendo 64, Dreamcast, SNES, Game Boy, and Atari games in the world at your disposal.
This is a quick and easy project with no programming or construction required. Excluding the phone, parts should cost around $50 total. What do you say? Interested?