I have a few pieces. Really a fascinating historical collecting hobby. Most are not really done by actual soldiers, but for the money you can't beat it.

I have an ashtray made from a Japanese 155mm Naval shell base and a couple of scimitar type letter openers marked Verdun

I have 2 37mm trench gun cases with inert projectiles and 1 ash tray made from a 105 shell case with a 50 cal mounted in the center

I have a beer mug made from a fired 105 Howitzer casing that has my Unit Crest on it. I made it myself though, so I'm not sure if it counts as "art"

I don't collect it but I have an accumulation from WWII that my Dad brought back. Mostly from N. Africa and Sicily. He was a USCG Pharmacists Mate on the USS Chambers, a DE, in the Mediterranian.

I don't have a collection. But I do have a bracelet that was made of aluminum from the wing of a Japanese zero fighter plane. It is one of several that were handed out by a classmate in grade school.