Snail Mail Craft Swap (Mystery Project!)

I've been a bit hush-hush lately regarding my current craft project, as it is for the Snail Mail Craft Swap with my dear (and oh so talented) friend Alia. If everything goes as planned I should be done with the project by the end of the weekend.

Any guesses?

Note: I'll reveal the 'finished' project (with a picture of course!) after it makes its way up to Oregon, and is in Alia's possession. Please be patient (hence, Snail Mail Craft Swap). :)