Here's an idea I've been kicking around for a while. It came up again a few weeks ago when I saw a woman mailing her quilt to Keepsake Quilting for their challenge. In a quilting challenge, quilters get some number of fabrics from which they can make a design of their choosing. The rules state they have to use a minimum number of the fabrics supplied, and they can only supplement with a certain number of additional fabrics. You can't quite work this way with cross-stitch, but you could have a common pattern that people stitched allowing them to choose fabric, floss, and finishing method.
How about a cross-stitchers' challenge? We could do it for fun to see all the different ways the pattern got stitched, or we could do it for prizes.
If the latter, we need to find judges and make rules. And the prizes, we'd need to come up with prizes. People could send in a photo of their finish and I could post them anonymously and put it to a vote, letting the visitors make the choice. Of course, people would have to be on their honor to make their entry anonymous.
So, would you be interested in participating in something like this? We could work on a timeline of a couple of months and make it a pretty small (free) pattern so it won't interfere too much with your already busy stitching schedule.