Originally Posted by PyroSporker
I have the Black HTC One and anything short of transparent I imagine will be very apparent on the device.
I'm still open to any non case ideas too
Check this TPU case out,looks to be quite transparent,even though the description states that it is frosted/clear:
Semi Frost Clear Hard TPU Gel Skin Case Cover for HTC One 2013 M7 Accessory | eBay
And one from AMAZON that claims to be transparent & clear:
Amazon.com: Transparent Clear Tpu Skin Soft Cover Case for Htc One M7 by ApexGears: Cell Phones & Accessories
The level of transparency is difficult at best to judge w/a TPU case,less buying it in-person.
Please keep us posted on what you choose & how well it looks w/your phone.