You don’t see it often, you hardly care, but you can. XDA forum user z31s1g created a materialised TWRP skin.
To get the skin you will need TWRP 2.8 or newer. The theme supports any display resolution(720×1280, 768×1280, 800×1280, 1080×1920, 1200×1920) and works on every ROM.
Visit the original thread on XDA to download.
- Download the theme of your choice and rename it to “ui.zip”.
- On SD card (if device has internal and external storage, use the internal) open the TWRP folder and create a folder called “theme”, without capital letters.
- Copy ui.zip to the theme folder.
- Restart to recovery.