I'd like to do something fun with it! Taking it apart and seeing the insides sounds cool to me but I'm open for suggestions!
They gave it to you, or did you pay the $1,000 core charge to the old IC and MCU back after the upgrade?
I paid the $1000. It's a cool keepsake and after hearing about how some service centers didn't wipe the data...just a precaution!
Send it to Jerry Rig Everything. Zach is a youtube guy who makes videos taking all sorts of tech apart.