I'm here to advertise Kousou Games:
Kousou Games is an independant Game-Making company who's here to offer you free games, tutorials, wallpapers, sprites, examples, reviews and an unhealthly amount of off-topic extras.
One of our games the Legend of Zelda: The Final Challenge, got a lot of publicity.
We have an array of Gamemaker Examples, Sprite resources, and of course Gamemaker Creations. If you're really keen, you could even join our forum.
Also, we have our own image generator, as you can see I'm using in my signature.