CitizenBrick.com sells this $250 Breaking Bad-inspired Superlab Playset. What this needs is an RV-themed companion with a Krazy-8 minifig.
This Lego Green Lantern Power Battery may be the best thing ever (at least for this week). This would be amazing as-is, but the creator of this at JustJon.Net hit it out of the park by a) making the battery actually light up, and b) having the light triggered by an RFID-equipped ring.
This chess board built with Lego Mindstorms is amazing. The group that built it has lots of information about more information about building this on their website.