I earned the first souvenir because i was able to solve the puzzle (with a little help). (I am premium member, so i got the mail a week earlier)
I don't know what to think of it. To be honest, i didn't even search for any cache that would match the criteria. I just went on a prior planned tour and at least one of those caches had the required 10+ favorite points..
Maybe the criteria are too easy (yet) to get the souvenir, but on the other side GS want to get more people to earn some of those pictures..
I am not really "hunting" those souvenirs, but for some challenge caches you have to have a certain number of them.
I would like it if the users could (under certain circumstances / rules) create ther own souvenirs. (e.g. find 5 or 10 named caches in a certain period of time (hours, days, weeks) or something like that) but the time is not chosen by Groundspeak but the creator of the souvenir or related cache.
So i will look after the puzzle, and when the criteria match my geocaching plans, i will collect the souvenir. if not, then not..