I've always looked at overshot pieces in awe, feeling like I could never do it. Use two different shuttles at the same time for tabby and pattern? With two different weights of yarn? And on my 4-shaft loom? My next project was going to be a sampler of various twill patterns, but now I've decided to face my fear of overshot instead and do an overshot sampler. I'll be using the Maltese Cross threading and treadlings from the Overshot Novelties chapter in my copy of Marguerite Davison's A Handweaver's Pattern Book. I'm going to get everything ready, yarn chosen, warp wound, draft enlarged and copied for use by October 3rd and then have at it!
Hopefully, there will be others with experience to help if/when I get lost in the web...
p.s.: Is this the kind of thing you were thinking of for the Spook of the Loom group?