Wonderful public-submission how-to site Instructables always has all kinds of contests going on, and with Halloween approaching, they unrolled a whole lineup of Hallow’s Eve themed contests. From costumes to jack-o-lanterns, they’ve got it all. But mostly, the photomanipulation one caught my eye. The deadline’s tomorrow, so sorry if you’re getting late notice, but I’ve been working on my entry for the past two weeks or so. Check it out after the jump.