Yeah there's a white and grey plastic back, they're for sale on Amazon from LG here :
https://www.amazon.com/dp/B00ZHW0XT4/ref=cm_sw_r_awd_Y01bwb62XBWFQ
Haven't yet but check this http://www.amazon.com/Genuine-Original-LG-Replacement-Metallic/dp/B00ZHW0XT4