i don’t think it’s too crazy of an idea? People who design album art at least get credited, unlike many poster designs which are often anonymous. Maybe a trade for a free cover in return for “Album art by: XYZ XYZ (http://www.xyzs website.xyz)” on the inside of the cover?
or have the site along with a name as a foot note on the cover, since (at least in my case) this will be attached to an mp3 file
possible perks:
free music (hearing the feel of the mix might help make the cover)
examples of pictures you might want in there (less headache for you)
generates business, if you have one