Today, the Legacy News blog (I'm assuming Geoff Rasmussen) showed a sample chart that pulled one of his kids photos in as a background - see his post Legacy Charting Tip - a mug shot for a background. I thought it looked very neat. I hadn't tried that before - it looked easy and it was.
I made four-generation charts for my father and my mother, using their photographs as a background (with about 40% transparency). Here's what they look like:
The user can control the sizes of the boxes, the spacing between the boxes, the color and weight of the boxes and the connecting lines, and the format of the items inside each box. To make the background in Legacy Charting, you click on Appearance>Backgrounds>Select Image and find the picture you want to use as the background. You can then set the Transparency level. It is really easy.