Yep, I remember Flea Market Flip. That show was fun but of course the "winners" were those who paid the least $ and sold it for the most $$.
I'd like to take the monetization out of the equation, or even any judging for winners or losers, and just show creative and interesting art pieces, or normal everyday stuff that's been made attractive and usable.
I'd love to see a teacher assign students to go into a thrift store and pick 3 random items like I see all the time: an old trophy, a DVD, an old baseball cap, puzzle with missing pieces, fancy high heels, 3-ring binders, old clocks, a Live/Love/Laugh sign, cordless drills without the batteries, plastic spatulas - you get the idea. Then have fun either breaking everything apart to make a wild art piece or figure out how to combine and repurpose things.