Googling for "rounded scsi cables" would be productive. But this is not a great idea - SCSI cables have less tolerance for error than IDE. That's one reason (besides the cost of SCSI in general) that you don't see many around. Stick with a quality flat cable, limited to the length and number of connectors you need, if clutter is important. If you've got $$$ to spend, Granite Digital is regarded as one of the top cable makers, and they do custom jobs. But be prepared to spend $100+ on that route. Not quite so fancy, but still quite passable, cables of shorter lengths should be easy to find.
And quoting Rage Against The Machine and your stock portfolio in the same sig is the funniest thing I've seen all week.