I found the idea of an airline ticket on bestdestinationwedding.com forum.  A bride on sent me the template and I customized it to my wedding.  I couldn't find the proper paper to print them on, and I really didn't want the hassle, therefore I sent my template to Prim & Pixie and they spruced them up for me.  They turned out awesome!  I highly recommend the Pixies - their prices are great and they are awesome to work with!  Everyone that received a "Save the Date" were in awe of them.