Here are some personal favorites, shown here in sacred geometry / golden rectangle proportions. Squares and other custom sizes are also possible. (For custom sizes, reach out via email with your contact info / phone number and I'll get in touch to discuss details.)
Finally, there are three options for finishing them for the walls, which you'll be asked to select as the second part of the ordering process: a flush frame, a recessed frame, and a traditional wood frame. Examples of each of these are shown in the images area.