How geometric! Trapezoid window openings are certainly an eye-catching way to allow sunlight into your home. These types of windows mesh well with the actual shape of a house - you generally see them along sloping roofs. Trapezoid, or tapered-side, windows are four-sided, but only one pair of sides is parallel.
We make customized window shades for rectangular windows and skylights. So if you have a trapezoid shaped window, your best bet would be to work with someone local to get the best fit for your special window.
We're sure you have other windows that are rectangle-shaped, though! So give us a holler and we'll gladly help you with those!