In return, she sent me this piece of art. I think the cleverest part is the red stars that reference the pane of art on the stamp. Even the red hand-cancel fits well with the red tones on the envelope. Genius.
I think Smash laments the fact that the sorting machine usually apply barcodes, and this one did not escape. I have never noticed the barcode include the full zipcode before, although maybe I haven't been looking closely.