Considering that your house has a different texture on the second floor (as opposed to the brick on the bottom), staying consistent with cellular shades might help tie it together. Although, depending on your color choices, it may not be too noticeable. What's most important is picking the type of window treatment most functional for the room. So, if you're worried about the "mish mash," using a solid color of roller shades is a neutral choice and wouldn't be distracting. It could even help with setting the lovely arched window upstairs you mentioned apart from the others.

Since all options are variations on shades, I vote all should match to improve the exterior cohesiveness. If you are looking at shades for black out purposes, visit your local big box hardware store of choice, they have lots of cellular options to select from including a dual opaque/translucent/vision clear depending on how you maneuver the sliding stack. You want consistent color finish on the exterior, without question. often the cellular can be one finish on the interior and a different color/finish on the window side facing exterior.

Hey There: First of all - roller shades are a very good way to cover large openings as well as panel blinds. For your convenience you can motorize your blinds and if no power is next to your window you opt for battery operating systems that are remote controlled. Up to 5000 circles on a single battery charge is pretty impressive.

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Good Luck with your project