One of my best friends had an issue with a guy she was dating who was... misbehaving. He had just given her a really cute diamond necklace before all the proverbial stuff hit the fan.
You know what she did?
Took a hammer, took the necklace, and Fed-Ex'd the pieces to his office.
A bit extreme, but she said it was a good "release".
I still have the jewelry my ex's have given me, 'cause hey, they are nice pieces of jewelry! I've just mentally blocked the sentimental value that they used to have, and if someone asks where I got them, I say my parents bought it for me

I don't wear them often, but I do sometimes.
I did have a TV that I literally gave away though... one X gave it to me a few years back, and when I finally had enough, I put up a Myspace bulletin: "Free 32" TV" and gave it to the first taker who agreed to come pick it up. I got a shiny new TV and I wouldn't have it any other way