I'm going a little out of order for this one, but I had to pick an awesome question to answer for my 100th!
((I kind of killed two birds with one stone with this animation, mostly because I already wanted to animate the robot unicorn, and I uploaded the unicorn alone to my main page. Animated in approximately 6 hours, foreground and animation done in Adobe Flash. Background and effects painted in Adobe Photoshop.))
Robot Unicorn Attack => Cartoon Network: Adult Swim
"Always" => Erasure
Adventure Time => Pendelton Ward & Cartoon Network