Okay since we're creeping into other interesting chord formations, I'll toss in one of my favourites - except it isn't "mine". I stole it from Merle Travis. It's a wonderful chord to finish any tune off in the key of E, and it's actually an E6th/13th. (It's the very last chord you'd play in a song in E.)

On the 12th fret, bar with the ring finger, the 1st and second strings. With the index finger, bar all of the strings on the 11th fret, except the 6th string (low E). Leave the low E string open. Now play the chord. Nice eh? (Merle had taste. *G*)