Guess What. The Mosaic Challenge Group lives!
Sadly, we've stopped using Flickr for the group, because there just weren't many people displaying their work there, and now we're using Facebook. However, there are a lot of nice features on Facebook, so it's been very positive.
You can find the group here. Mosaic Challenge - Facebook
Currently we're all voting for our favorite "Fantasy Wonderland" pieces, found here: Fantasy Wonderland Photo Album
Here's a look at the entries we have so far for Challenge #65 - South of the Border