I dont think that you can easy find an custom back cover for the G2 international, and if you remove the cover from your g2 then you could damage the phone if you dont do it carefull, you could order an original back cover and change it yourself but the result may not come out good. I recommend to find an good case since that secures your phone and gives your phone maybe a nicer style/feeling in the hands.
Devices History
Htc Elf-Htc Google Nexus One-LG Optimus 2X-Samsung Galaxy S2-LG Nexus4

"Simplicity is the ultimate sophistication."
"The greatest ideas are the simplest." William Golding
"Simplicity is the art of maximizing the amount of work not done." - Agile Manifesto
"Simplicity is the way a human/developer should think to easily solve problems." - Wulsic

My Work So far