Haven't done it in a long time, but years ago I had a similar realization that picture frames were cheaper than cards. So you can frame a little note, either with a picture or just suggest they can reuse it if they like. Buying greeting cards always felt like kind of a waste. Lately our kids' schools have been doing a thing each year where the kids do some art and then you can buy cards (and other things) with it, so we've been using those as they're at least a bit personal. Once that's done, maybe I'll give picture frames again (or paperbacks or cans of tomato soup...)