I posted my first panel on the previous page, it is a rework of the many posters on here. I have no Photoshop or GIMP experience but had a go.
What you can do is create your own background based on pixel size (H x W) using something like GIMP. Set that as the background to an existing panel and then use the X,Y settings in the SensorPanel Manager to move the components around to how you want to display them