"Spiderville" is what I once called the loft space in my old house and in our family, it's now used to denote any spider-inhabited domain. And here's a helium filled one, which gives me the shivers just looking at it:
If you must make such horrible items for your Halloween party (and even I'll admit they'd look extremely cool), you can find the tutorial over on Crafty Crafty.
Boot Cuff Free Crochet Pattern
17 hours ago