LEGO Rock 'em Sock 'em Robots
This was a fun build using the two different colored boxing gloves available. First conceived back when the Team GB Collectible Minifigures were released, but I just got around to building it earlier this year.
I think the Hero Factory masks really work well for the robots, as do the spring-loaded legs from the 2002 LEGO Sports line.
I used the ring to take an Iron Man v. Captain America for Instagram a few months ago (pictures in my Instagram link below).
Special thanks to Jason Marcus for letting me borrow the blue boxing gloves!