I should emphasize that the new patterns are just me screwing around - they are not
intended to become standard color options.
Really? I think you should reconsider.
The hardcore techie crowd will be all over black nylon/mesh type setup, but revenue-wise, that's a small niche. For broader appeal, it needs to be a fashion accessory. The kid in the cubicle across from me routinely comes to work in plaid shirts and brightly colored shoes, with a light blue canvas messenger bag. If he gets a tablet, there's no way he's buying a black mesh tech sling. The plaid? Very probably.
By the end of this year there will be roughly 100 million iPads on the market, and nearly all of them look identical. A Holstein-patterned carrier is one way to both accessorize and individualize the purchase, and people go for that sort of thing.
In short, do you want to ship 10,000 of these things in the next five years, or do you want to ship them in 10k lots?
Also, I hope you're carefully documenting all of these experimental variations you've come up with and are turning them over to a patent attorney, because when this product succeeds, you're going to have Samsonite and Targus sniffing for a piece of the action. It will be helpful to have some ammunition to fire back at them when that day comes.