Hello all,
I also like Challenge Caches very much (and so do a lot of geocaching friends of mine)! I would love to see them with their own icon. Why not use the "old" challenge icon for that? And further more would it be very easy for Groundspeak to identify them (from the normal mysteries), because they have to have the word 'challenge' in the cache name.
so, please Groundspeak, go for it! And I promise it will be well receive in the cacher community (definitely better then the last challenge approach :-)
have a nice day!
friesede