Note: this is just a very rough initial version. I don't use Midnight Commander myself, so any improvements will be welcome!
Download skin file and set MC_SKIN env variable to point to it:
mkdir -p $HOME/.mc/; cd $HOME/.mc/
wget https://raw.githubusercontent.com/jan-warchol/selenized/master/mc/selenized.ini
echo "export MC_SKIN=$HOME/.mc/selenized.ini" >> $HOME/.bashrc
Keep in mind that you need to restart your terminal or reload your .bashrc
manually for these changes to have effect.