My goodness, I've found 3 challenge sites that are looking for DT members.
Kadoodle is looking for people to commit for 6 months. See all the info at the talented Bev's Blog. This DT call finishes on 1 December.
Basic Grey have put the call out for 3 DT members - and one place has gone already. This one closes on 6 December at the latest - if they don't fill the positions before then. Find all the details here.
Whiff of Joy are looking for a guest designer for the next 2 months. Their call closes on 6 December too. Find all the details at papercraft plant - here.
Best of luck to all those who enter - I may even try a couple of these myself but as there are so many incredibly talented people out there I wouldn't hold out much hope for me. Why not give them a try yourselves? You never know, you could be a lucky one.