I really like the “onion domes” you often see on Russian churches (Resurrection Church (right, from Wikipedia)). It is also a nice design element to put on the end of a board that would otherwise just be hanging out in the breeze. If you imagine taking a slice through the middle of a dome or pressing one flat (like a flower in a book), you get the idea. You can draw them free hand with just a circle/ellipse template, square, pencil and divider (or ruler) or crank up your drawing program. For the project I just finished, I did them free hand and for this post, used CAD. I drew them somewhat backwards, by starting with a fixed board size (2” x 2” and 3.5” x 2” in this case) and smooshing the circles until I liked the shape.
– The circles touch at their tangents so the transitions are smooth, I did no blending.
– The top ellipses are centered on the board corners. That makes laying out both sides easy and makes the “point” look “right” and transitions smooth.