Ok,
1. Download this logon
My_very_own_logon2. install logon
3. find the wallpaper you want to use and rename it
Bitmap_100.bmp (it is very important to use a .bmp for this, .jpg will
not work)
4.Open folder: C:\Program Files\WinCustomize\LogonStudio\My_Very_Own_Logon
5. Drag and drop
your Bitmap_100.bmp into the folder to replace the one there.
6. Open Logonstudio and apply.
Never try to edit in logonstudio as it will change the configuration
Have fun!