I looked around for some nice TWRP themes in 480X800 resolution but..it wasn't that easy to find. They were all for older versions or not in my taste.
Next theme out is miui inspired, but with original twrp layout this time.
My first attempt to make a theme, so it might not be "perfect", but it's "good enough" :P and it works fine.
Thanks to @nathajoz for the base-ui.zip
Rename to "ui.zip" put it in /sdcard/TWRP/theme.
If you don't have a "theme"-folder in there, just create one.
Reboot to recovery and it loads automaticly.
Works on all devices with 480X800 running twrp 2.6.XX-188.8.131.52.