My friend Michelle has been doing a lot of letterpress printing for some of her recent art projects, and she clued me in to these fantastic deckle-edge cards by Fabriano. They're inexpensive and support all sorts of media gracefully. Tsia and I have been using them to make our own Thank You cards with watercolor, pen and ink, and whatever else we have on hand. I love the texture and weight of the paper. It feels very luxurious.
I should point out that the cards are a rather unusual size, and it isn't easy to find matching envelopes. Believe me, I tried. I thought I'd find some fun colors to pair them with, but it wasn't meant to be, despite trying our fantastic local paper and envelope supply shop. So the coordinating envelopes are well worth the additional cost. Just keep that in mind...
