I'd never thought about making handmade lettersets, but apparently creative people find all manner of things to make. Hollycm6 sent me some wonderful stationery stitched from Alice in Wonderland and Peter Pan book paper, and both lettersets include self-adhesive strips for easy sealing.
I really like the handmade envelope she sent them in, too, especially since I get to keep that particular one instead of feeling as though I need to use it! I also like the stamps she affixed on them, particularly the faux stamp for the Dandelion Weald that she made herself. I finally got postage-edge scissors recently and I can't wait to try making my own faux postage at some point.