I used to wear these Prince NFS Indoor II shoes back in college. This line is still going strong apparently.
Here they are in black and white:
These black and yellow guys are pretty cool looking:
Prince NFS Indoor
These are the original NFS indoors.
Here are the gray guys, in the US market only:
Buy (Canada): sportsvirtuoso.com
And here’s the classic blue:
Buy (US): squashgear.com