If you don't like the white background of the image islands, you can adjust this in the theme's .css file.
This works up to Framework Version 5.0.5
To add an image, add the two background lines below to the .islandpage section of the .css file inside the themes folder:
The image should also be placed in the themes folder at the same level as the .css file.
If you wish to change just the color, you can change the background-color value which already exists in the .islandpage and is set to #ffffff (white) by default.
Framework Version 6.0+
You need to add the following tags