Made with Blender 2.32 and the GIMP.
It's just the splash_top.png so you have to save the image and then copy it into the folder:
Hope you like, it there are also wallpapers to this theme, so look in the user info of sbb or just click above here on the link sbb.
Sorry for my poor English, I'm German.
Please send many comments and suggestions - I want to improve :-)