Debated with myself about posting pictures of my Colosseum since I honestly think that there are many builds that are way better than mine but I figured storing pictures here would be good if the world would ever reset. I spent roughly a week building and gathering the materials, approximately 30 deaths from the times dying from fall damage. The materials I used for the arena is Endstone Bricks, Sandstone and Smooth Sandstone. The design of it was made by me but I had a little inspiration from the other Colosseum builds I've seen online. This is my take on the actual Roman Colosseum in modern times (hence why there is a gigantic hole in the front).
After trying numerous designs and going through various trial and error sessions, I've decided to just be organised and careful and planned first. I began using my compass and a sheet of graph paper from my own school pad that cost about a dollar fifty.
(The night time Shaders pic is my favourite ^^)