We try to have a theme like masculine, Birthday, brides and babes, Christmas, Thank you, blank cards, etc. We have even done gift bags.
My own personal goal is not buying anything. It's great because my stash of stuff I'll never use is dwindling! Each card doesn't have to be the same. Like I did here, the layout is the same, but the paper is different. Great for getting rid of scraps.
I have become really good at making cards, the hard part is giving them away. I don't give cards out as much as I make them. Plus everyone in our swap group makes such cute cards I don't want to give them away!