It's your system do whatever you want and live with the consequences, capish.
If you like a graphic design custom or otherwise from a catalog, check local "sign makers". They offer vinyl typically that can be applied. I'm sure you've seen p/u trucks and buses with vinyl applications on them for some ads/logos/ or eye-catching attention. As for any "metal" applications when look for custom "laser machine shop" for custom materials to generate such. You still have to apply, so sharp corner or bends should be at a minimum. Sign makers may cover both types of materials, but you have to call. There maybe online vendors, but with local you can come-up with "idea" and allow their artists to bruce it up. Oh yeah, expect all this to cost more than you think, but you could be surprised even on pricing when you consider it's "custom" and what you wanted.
I'm looking for a new covering for my HP Pavilion, specifically an aluminum one. Does anyone know where I could go to find one. I imagine I might have to custom order something like that.