Designing for art glass windows falls into two categories, fine art and commissioned work.
When designing for a fine art piece all the elements in oil painting are used here.
There a few more elements that go into designing for a commissioned glass window. The first thing is the client's budget followed by what they are looking for such as a geometric design, flowing or something else altogether. Once I establish a price range and get a feel for what they like I can then start designing. Ideas/inspiration for a particular location come from the architecture of the building, design elements around the space both interior and exterior and pulling in elements of nature. With multiple windows I create designs that move and flow through them, moving the eye back and forth as opposed to one design repeated.
Another element I look for in designing is the flow of the room/space to determine how the design should flow. If there is a wall to the right of the window/space and the room opens to the left then the design flows right to left. In some cases I also look to the exterior flow.
Other design ideas come from the location of the window such as in front of a bathtub. I created a design that looked like water flowing into the tub.
Inspiration for glass window designs comes from many sources and I enjoy creating a design that looks like it belongs in the space it is going to occupy.