Looking for some pizzazz for your forms? Well, why not add a background image?
An example can be found here.
To use this feature;
After you've uploaded it, you can use the built-in image editor to adjust levels, crop, resize, or even add annotations to your background image. Click on the image after it's been uploaded to pull up the image editor.
You can also blur the background, or add a semi-transparent overlay color, using the Overlay menu (found farther down on the page).