Minecraft Middle Earth is a Minecraft community that recreates the world described by JRR Tolkien and his writings. Everyone can participate in organized events in which we collaborate to create major landmarks, terrain, caves, castles, towns, farms and more.
The ThemedBuild has to be on the theme of that week in order to apply for ranks, hence the Themed in ThemedBuild. To apply for commoner your building doesn't have to be particularly skilled but needs to show effort in order to count.
You can see this weeks themed build here.