Is there any way I can change LG KC910 theme?

Sorry but unfortunately you can't without hacking your phone. Correct me if I am wrong but according to my web searching, The only way to get themes on the lg cookie, your phone, is to download special hacking software and to install the themes yourself. This could easily result in your phone being "bricked" meaning that it will not turn on or do anything.
Hope this helps, Please rate

like other cellphones without Os, you can't change your phone's themes.
BUT there is a dangerous way that may succeed or destroy your phone:
Flash ( installing the base software of your phone that can be done by phone servicing shops)
your cell phone.flash (install) symbian os 60 series v9.4 or another Os that you think might work correctly with your phone.

dear sir,
plz click on the below link to download free themes for your mobile
http://www.mobilerule.org/Free/Mobile-Themes/
thank you..take care

DEAR SIR,
PLZ CLICK ON THE BELOW LINK TO DOWNLOAD FREE THEMES.......
http://www.mobilerule.org/Free/Mobile-Themes/
THANK YOU..TAKE CARE

You can try lg website where themes for desired mobile model are available for free.

just visit mobango.com or download wap.com from your handset and you will get you themes

I go to a website call mobile9 to get my themes for my sony phone, I sure the themes will work on the lg cookie too!

LG KP500 (Cookie) doesn't support themes

Guys, you probably know, what RTFM means? Read The F****ing Manual! It says that LG KP500 or Cookie, that one with a FreeTouch technology and a Stylus Pen atached to the bottom DOES NOT SUPPORT THEMES!

one possible solution would be to flash the old black prada firmware onto the silver phone; as far as i know the hardware of the phones are identical?

however, you would lose the white theme, qwerty keyboard etc.