The side in the photo is our garage, the other arch is smaller and is a bedroom. We thought about windows, but aren't sure how economically they would be.

The cheapest option to minimize the look of them would be to paint it a color that closely matches the brick. You could always start with that.

Thank you! We will look into this!

Call a custom window dealer to come out for a recommendation. Or show your photos (from inside and outside) to the manager of a local glass place to see if they can recommend a local window maker.

Hello, just a thought: I love that arch! It is a very unusual and distinctive feature of your home, and works well with the curves in the brick on either side of the wall. I would not try to minimize it or square it up, but instead dress it up a bit. One suggestion for the garage would be to put a window in the top ⅓ or so, and change the material on the bottom ⅔ -- perhaps a painted cement-board panel, or horizontal wood strip. If there is siding other than brick anywhere else on the house, then perhaps that material would work well below the window...

Thank you @david D. the small window atop wasn't something we had thought of, that's a great idea!

Would a large sconce look good there?

Or a wall fountain?

I would hesitate to chop up the arch with blocks of windows, though I'm sure you could use light in the garage.

Planter box with trellis and ivy or clematis?

I like the idea of the sconce! We were trying our best to convert the house to more of a ranch style look, but I'm not sure how that would be done...