I love # 1! Great idea!!!
The circles should be really easy to measure. just tie a length of string - the same as half the height of the circle - to a pencil and tie the other to a push pin. stick the push pin in the wall where you want to start and draw a circle with the pencil using the push pin as your pivot point. You can use the assembly to measure the rest too.
animegirlie













Well - You could cast resin cylinders or boxes and carve them. Most hobby shops (read as train or model shop - not arts and crafts) sell some sort of castable polyurethane resin. It usually comes in white, yellow, or clear. Avoid the yellow it tends to be hard to carve and breaks easily according to my S.O. If you get extra special fancy you can make molds of the designs you want and cast it in resin. Resin is EXTREMELY toxic pre-casting and difficult to work with - but I have witnessed the process first hand and it is possible to do at home. The csting method is great if you plan to make multiples of the same piece. 








