I am using the mobile theme for jetpack, and on my site my images are not showing up.
Could you post your site URL here, so I can have a look?
If you want it to remain private, you can also contact us via this contact form:
http://jetpack.me/contact-support/
how do I change the background color?
You can check this tutorial to learn how to customize the Mobile Theme:
http://jetpack.me/2013/06/27/customize-mobile-theme/