I just found this thread. I am sorry I have not had time to read it all - but did any one mention the SCS cards for a cause? It is listed under the Challenge forum. Cindy (mothermark) lists a monthly cause to receive our cards. I am pretty sure that you could even go to previous months and send to some of the older ones.
Cards for a Cause Forum - Donating New, Used & Recycled Greeting Cards - Splitcoaststampers
I have been sort of doing this challenge for a while - though I do cheat and have made some purchases. Most of my cards are on my blog, a few in my SCS gallery. I am doing the blog only to have one for my challenge cards - and I have at least one a day since I started, though this week will put me behind!