During the month of August 2013, Goundspeak is encouraging cachers to attempt to find a cache a day and in doing so the cacher will receive a special souvenir. If your not aware of this, you can read about it at "http://blog.geocaching.com/2013/07/geocaching-plans-for-july-13-and-all-of-august-you-do-now/"
So, if you want to try your luck at a geocaching streak and earn some (or all) of these souvenirs, then maybe this PG will help you on this goal.