Here are themes you can download for your ServiceNow Geneva or Helsinki instance. This includes 15 new themes created by me.
Blimey
Blues
Camouflage
Captain
Clean
Contrast UI
Dark NOW
Fab Five
Federal
Glamour
Flamingo Nights
Halloween
Hulk
Ironman
Ne
Rose
Seahorse
Spring
Terminal
Thor
Vikings
Vintage
WerkPress
Williamsberg
Download themes: sne_sys_ui_themes_v1.zip