I was buying a birthday card for someone the other day, and couldn't help noticing the other types of cards you could buy. There were several categories specifically for friendship. Some were black, others had a nice sentiment written in them already. I never noticed how many different types of friendship cards there were until now.
In the past, I've purchased a lot of cards to send "just because" to friends, but they were usually labeled "humor" or "black." That's why it was such a nice thing to see so many cards specifically created for friendship.
Now, you know what I'm going to say next, right? You need to get yourself a couple of these cards and just keep them handy the next time you feel like sending a note to a friend. Never underestimate how much this means to your friend. It's nice to be thought of.