Big thank you to Nirewen#6392, Jiiks, Maware#2031, Omniscient#7994, Zerthox#6648 and Hammock#6027 for helping with all of the CSS issues I encountered. Apologies if I have forgotten to mention anyone.
##Spades Slick:
##AJ's
##Custom
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Open up discord, navigate to settings > Appearance and select the 'Dark Theme'
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Navigate to BetterDiscord > Themes and click "Open Theme Folder".
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Drop the theme of your choice inside of the folder which will pop up.
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If the theme doesnt appear in your themes list, restart discord and go back into BetterDiscord > Themes and select the theme of your choice and restart a last time.
The theme will activate after the last restart.