Another extension of this idea: how about we use something from the archives of
http://ccmixter.org/ . It's the creative commons site that hosts thousands of freely remixable tunes.
It could be some sort of marketing gimmick to drive traffic to both of the sites. "elektron-users.com in conjunction with ccmixter bring you the first annual Elektron remix competition."
Something like that.
If that's taking this thing too far, I would only suggest that it doesn't matter what song is remixed, just as long as we can all download the source.