It may be morbid in certain respects but then consider, as PaphMadMan said, how bones have been used throughout history for various things from art to tools and well it just seems rather frugal and efficient.
After all bone-meal fertilizer is not an uncommon product, so I would guess a lot about Gardening is morbid when you think about it. A compost heap is just a pile of decaying plant matter, plants that were once alive... Petrol is just what remains of organisms that died ages ago, so you could even say driving is a morbid activity if you wanted to take it that step further.
All a matter of perspective.
I wish you all the best with your project and I'm sure your fella wont be too upset. If it makes you happy and you're not hurting anyone, where's the harm? (other than to the bank balance)
Just means he gets a free pass on a future purchase of his choosing.