So you want to be an NDP

MGP helpfully lists all their products on their website. Here's a table of the mashbills for the whiskeys they offer.

Whiskey Product	% Corn	% Barley Malt	% Rye	% Wheat
Bourbon (45% Wheat)	51	4	0	45
Bourbon (49% Barley Malt)	51	49	0	0
Bourbon (21% Rye)	75	4	21	0
Bourbon (36% Rye)	60	4	36	0
Bourbon (99% Corn)	99	1	0	0
Corn Whiskey (15% Rye)	81	4	15	0
Light Whiskey (99% Corn)	99	1	0	0
Malt Whiskey (100% Barley Malt)	0	100	0	0
Rye Whiskey (49% Barley Malt)	0	49	51	0
51% Rye Whiskey	45	4	51	0
95% Rye Whiskey	0	5	95	0
95% Wheat Whiskey	0	5	0	95

You can see how a blender who knew what they were doing might do some interesting things. Want a rye whiskey that's a blend of 70% rye, 20% corn, and 10% barley malt? Try 12.4% of the 49% barley malt rye whiskey, 44.4% of the 45% corn rye whiskey, and 43.2% of the 95% rye whiskey. If you weren't concerned about calling it a straight whiskey, you could probably bottle pretty close to any combination of the four grains listed.

Or you could set up like Whisky Blender, stock up on a few barrels of each, and let your customers design their own blends on a per-bottle basis. I expect most of the results would be uninspired, and I don't know what you'd do with all that light whiskey you bought just in case, but it might be fun.