Here's a little tip for you! Do you know how many thank you, thinking of you and other useful sentiments are included in all the stamp sets you own. Well, I didn't know. And everytime I wanted to make a thank you card, I found myself going back to the same sentiment because I couldn't remember where to find something different.
We'll I did a little organizing a few days ago, and this is what I did. I went through all my stamp sets and stamped each of the sentiments on Whisper White Cardstock and then punched them out with an appropriate size and shape punch, wrote on the back the name of the Stamp Set they belong to, sorted them into categories (thank you, thinking of you, friend/birthday), and then put them on rings.
It works like a charm and I will never again be at a loss for words!