I've recently added a few cabinet friendly PC games to my Hyperspin setup.
Namely:
SFIV
Injustice
Castle Crashers
I'm planning on adding a bunch more since I've been having a blast with these.
Since I had extra buttons laying around I went ahead and added two more buttons to the middle two controllers. I know a lot of people don't like the curved layout or an 8 button layout but I really like both for some reason.
Attached is my default colors for PC games since it matches the Xbox controller layout. I'm thinking of doing some game specific ones. Maybe all buttons same color for the fighters or top row all the same color and bottom row all the same color but different than the top. Any ideas for some cool looking layout?