Bonnie Hunter has great instructions with pictures for every clue of her mystery quilts. Planet Patchwork has a one day mystery quilt on Super Bowl day ? or New Years Day I can't remember which one. Lots of quilt blogs have mystery quilts going all the time.
http://quiltville.com/ -- Bonnie just put a Christmas mystery quilt on her blog here:
http://quiltville.com/
http://www.planetpatchwork.com/ - FYI: Has a new BOM starting in Jan.