Option to add background image

[TheShovel]

Option to add background image instead of just a color option. You could also add how the image will display, with options like "repeated", "Stretch to fill" or "Keep original size".

[PPPDUD]

Support. This would be useful, especially for anniversary projects and such.

[VBPROGER]

If you're converting to .HTML you can use custom CSS to achieve this.

[GarboMuffin]

you can use custom CSS in any of the environments

[TheShovel]

A built-in option to just choose a image would be handy and easier to understand for people who don't know CSS.