A couple of months ago I printed some custom letterpress notecards for myself and as gifts for friends and family.
Each card is A6 size (148mm x 105mm). I printed 10 of each card and paired them with 10 recycled envelopes, tied up with coordinating yarn. I think I would like to get some baker's twine (maybe Divine Twine, although that stuff is pretty pricey) since it was really coincidence that I had yarn that matched the ink colour I used.
I played around with a variety of fonts and pretty ornaments to flank each name. I think my favourite combinations are the top and bottom examples in the picture above.
Once I get the studio back up and running I will be offering custom notecards in my Etsy shop.