In Chinese traditional Building，roof edge has uniform structure，displayed in picture above.The cylinder is called as "Tile Head",the Triangle is called as “Water Dropper”，and they have many kinds of pattern.
Search “瓦当图案” in Chinese picture website，you will find many different elaborate，some of it came from real old building，part of it have copyright，be careful.
Then ,you may make some roof texture or download it.
Picture above is what I made, click Here if you want texture,no copyright.
Model I Make ,considering a lot of it render in scene,as less as possible vectors I used.
Last step render it in unity,I use a tessellation shader called Beast,a lightweight shader，downloaded from Asset Store.
Roof is actually a plane，roof edge is model,in order to promote stereo perception
.The tessellation shader is quite effective.Left is Tessellation shader,Right is Unity Standard shader.