You'll definitely need a palette clenser after being here. These places will help with that.
Fantasy Anime: Amazing source for emulation tutorials. Ancient anime without any bullshit. This dude has been doing his thing for a really long time, and is sincerely a really nice guy.
The BIG List of Video Game Randomizers: Never be bored ever again.
wallhaven: Wallpapers. Lots of wallpapers.
The Cutting Room Floor: Wiki dedicated to researching and documenting cut game content residing within the game data itself. Everything from missing levels, to angry programmer NSFW hidden messages left in Nintendo games.