This is a technique I learned a while back from a fellow demonstrator Jackie Hart. It's called the "filter paper technique" - I've also seem a similar technique that's been called the "tissue paper technique." I like this better, though, because it uses the Creped Filter Paper from Stampin' Up! which holds up a lot better than tissue paper.
The amazing texture that results from this technique is hard to capture in a photo, but trust me, you will love it! It's like you stamped on beautiful artisan handmade paper! And it's so easy! Check out my how-to video below, or over on my YouTube channel.
Note that I used a few retiring products on this card that - as of when I'm writing this post! - are still available... but only while supplies last! I used the En Français background stamp (which I just finally bought myself and now it's retiring!), the Scallop Trim Border Punch, and Raspberry Ripple ink (the cardstock is no longer available).
Happy Stampin'! :)