Muhlenbergia lindheimeri is listed as a blue-gray grass and looks that way in our yard. Though there are examples that appear more green to me. The attached link shows a couple color variations. A very nice ornamental grass that does well here, but less rounded than the other grasses and sedges you're considering.

Here is a link that might be useful: Lindheimer's muhly

Blue-Lyme Grass, Elymus arenarius (Leymus arenarius) is a very blue grass without a hint of green that grows well for me in a very dry situation. It spreads by stolons but they are easy to pull up. I have no problem controlling it. I'll take a photo later. I've grown it for two years and hasn't bloomed, which is fine with me since the blooms are beige..

Here is a link that might be useful: Blue-lyme grass on Google

Here's a photo ...

Some of the switch grass (Panicum virgatum) cultivars are "red" and some are "blue." Google around on those and see if you can locate one of the blue cultivars.

Little Bluestem "the Blues". I have not grown this one yet , but we sure have some blue Bluestem north of Lampasses on RT. 281 that are quite blue. My Little bluestem that is native around Austin area of the Hill Country is green.