Here's a time killer for you: The Johnny Cash Project
is a crowdsourced video for the song "Ain't No Grave" that's constantly evolving. The project invites participants to redraw, using a custom tool on the site, hundreds of frames of archival footage. As more people contribute, the video continually changes, though each contribution, even if it's redrawn by someone else, remains on the site archivally. Which allows you users to do things like select a version of the video that includes only drawings that employ pointillism or those highest rated by the community.
Aaron Koblin, the man behind Radiohead's "House of Cards"
video, is a creative director on the JC Project.