It’s a bit late to post these in time for christmas, but how about sending your thank you notes in these hand-made origami envelopes?
This is a simple design that’s folded from a single sheet of paper, and whatever is written inside is completely hidden when folded – a nice surprise for whoever recieves it.
This may not comply with US postal regulations, so check carefully if you’re sending letters around America – you can always put it inside another envelope, or just stick to hand-delivery for people who live close.
I found this on Instructables, “a venue for showing what you make and how others can make it”. There’s loads of projects on there, but not much in the way of paper crafts at the moment.