A beautiful hacker theme with only two colours: 00ff00 and 000000. Only tested on Raspberry Pi OS, but should work other LXDE Linux system.

mkdir -p $HOME/.themes && cd $HOME/.themes
git clone https://github.com/cycool29/hacker-theme-linux.git

Then use lxappearance to apply the theme:

1. Launch lxappearance from your terminal.

2. Choose hacker-theme-linux in the Widget tab.

3. The window will be themed as hacker-theme-linux as soon as you clicked hacker-theme-linux

4. Click Apply, and all windows on your screen will be themed to the hacker-theme-linux!

This theme is created using Oomox Theme Designer.