Clear postcards?

I was on Pinterest the other day and I saw a post that had a picture of clear postcards-- I was really curious so I clicked on the link to the blog and found some more pictures! The postcards are made with packaging tape!

Here is a picture, and I thought this idea was really cool! So I was thinking since today is a Sunday and there's not much to do, I could try to make some and maybe send some out!

Isn't this such a cool idea?? Or am I like the last person to find out about this?

The blog that I found it on: http://angrychicken.typepad.com/angry_chicken/2013/06/packing-tape-and-debris.html