The pink one has been made by dd,age 7, and the red ones by me. I love craft, I find it very relaxing. Having my children home with me gives me the opportunity to do these simple things, that I would otherwise not get to do. Probably, I would never get the chance if I had some high-powered career.
And they are personal, no off the shelf-generic cards here. And given that most cards these days are positively bawdy, that's no bad thing either.