I am not much into the advanced programming of the HMI but enjoy playing with the simple graphic side of implementation. Perhaps we can use this thread to put together some sample background graphics to share? Here's one to start. I have this background hosted on my website. Feel free to link to it if you want to play around with it.
Nothing too tricky. I copied and modified some images. I downloaded a free program called paint.net. You can get it at getpaint.net. It has some great tools that are similar to adobe.