Now that more people have finally played and beaten the game (and/or has looked up all story paths), I can share some pretty cool stuff. I am going to spoiler tag everything because of the obvious.

(SPOILER)

Lots of awesome Undertale wallpapers. I am currently using the first person Sans one without any words. Be sure to load all of the imgur album to see them all!
http://imgur.com/a/tolsG

Aftertale. A fan comic that is very creative that centers around Sans and his knowledge of the rests. It's still currently in production, but there is plenty to read.
http://loverofpiggies.tumblr.com/pos...mic-or-is-it-a

Anyone who gets this will be crying with laughter.
http://i.imgur.com/3qKbgQr.png

Realistic Genocide route Sans. Terrifying picture.
https://www.artstation.com/artwork/kwrWA

Want to screw with the game and jump to points without actually playing through the whole thing? Here you go!
http://crumblingstatue.github.io/FloweysTimeMachine/