This might actually take longer than you would expect, but I am loving the results!
All you need is plastic canvas, yarn, a hook, and a needle.
You can get your plastic canvas here from Michaels. I went a really long time not knowing what that magical stuff was called.
Stick and shove as much yarn into each hole as you can, weaving in and out of each space till you can't possibly shove any more yarn in. Put your favorite movie in this is gonna take a while! I would recommend Amélie.