This video will show you how to change the color of your sms and imessage bubbles on your iphone or ipad. This method requires a jailbroken iphone or ipad in order to work. To change the colors of your messages please follow the below steps:
1. Open Cydia
2. Search for and install app named "Messages Customiser"
3. Once app is installed, go to Settings - Messages Customiser to customize the settings of your sms text and imessages.
Link to website: http://evasi0n.com/
If you have any questions, please feel free to comment, I would love to do what I can to help make this work on your device.