No new code shared, I’m afraid, but I have continued to update my image that I use for a custom logon background in Windows 7 (which I am still using at work). The feature does not work in Windows 8, but I still like it as a wallpaper. In Windows 7, you can set it to the custom logon background via Tools –> Customize Windows Logon Background on the menu. The program has a few images that I have done, but by far the best is the one shown below. (This is based on the default Windows 7 logon background, with heavily modified colours, and lots of additional painting, in Photoshop, and the .psd file is in the source code download as well.)
You can get this program feature either by extracting and running the built application, or the source code if you have Visual Studio 2012 (or newer).