Just a curiosity, but I wonder what one can do with a blank self-adhesive stamp?

Actually, this is the selvage result when you tear apart the weird format used in the recent US issue of the Romare Bearden Stamp. It's the one position (third row right) where you have no printing on the selvage and yet it contains die cut perforations on 3 sides (with straight edge at the end of the pane). Not surprising, under a bright light, you can see the tagging on the stamp also, which makes me wonder if automated post office equipment could mistake that "blank" stamp for legitimate postage.
Anyway, the one slight variation (other than size) from the actual stamp is the unique die cut perforations at the locations shown below, which is carried through on all positions of the pane where the stamp meets the selvage:

While this is nothing spectacular, I just find it an interesting curiosity that I'm sure some creative stamp collectors will put to use in one way or another.