What a nifty idea! if you want creative envelopes, go to Maps, map the route from your letter to the other person's mailbox. Print them up, fold them into 8 by 11 envelopes (or smaller if you are sending cards). This would be cool for pen pals
And if not this Lettermate, maybe a different one to suit my project. The Lettermate is an address stencil that keeps your writing straight and aligned, as well as letting you decorate your envelopes with hand-drawn designs.