About the themes I created for Vendetta, a mobile modification of Discord. You need Vendetta installed on your device to get the themes work.
An unofficial guide for the vendetta-mod poly theme format.
Copy the raw link for the desired theme and paste it in Settings -> Vendetta -> Themes -> Plus Sign
to install the theme.
Raw link: https://raw.githubusercontent.com/warudooooo/VendettaThemes/main/Oled-Blue/oled-blue.json
Raw link: https://raw.githubusercontent.com/warudooooo/VendettaThemes/main/Monochrome/Monochrome.json