I did an Avalon skin for personal use if you want you can try it. I edited my Avalon skin to grey scale so the fonts won't be blue but can be changed easily.
If you want multi image backgrounds you will need "C:\ProgramData\Team MediaPortal\MediaPortal\skin\Avallonis\Media\weather\backdrops" folder. I have it but it is 68 MB.
Steve
Awesome! This is exactly what I needed.