Wow. Some amazing stuff here. You don’t always have to work with plastic to get the “kick ass custom” moniker here. 😉
BennyBroca over on HissTank has posted some very impressive customized box art and package art and really manages to capture the vintage style. My personal favorite is the customized box for the MASS Device, which has two images I’ve mirrored below. Definitely check out the thread to see the other pics, though, they’re all awesome.