With chrome theme creator you can create your own chrome themes in a few easy steps. Just find an image that you want for the background of the theme, go to the theme creator, upload it and click on Pack -> ‘Pack and Install’. In a few seconds, you’ll get your theme installed.
You have additional options under image and color, you can customize almost all parts of chrome.
If you create an account you can create and publish multiple themes which will be available for further editing if needed.
You can get backgrounds from here: hdw.eweb4.com
Browse themes here: themebeta.com
My themes: themebeta.com/user/180164