Problem is there is so little differentiation between models. I had to put a sticker on mine just so it wouldn't get confused with other Airs; may as well use something fun and hard to duplicate.
My first sticker on the air happened when I went to Campus Party Brazil. It hosted 8.000 Campers in a high tech environment. My tablet alone had about 100 people. The amount of Apple machines was too high, so I placed a sticker to know which machine was mine... today it looks like: http://i.imgur.com/i6koYyC.jpg
