Thanks for the feedback everyone. I have limited ability to set some elements for three different themes (main colours and a header image) , so have attempted to approximate the colours from the old forum which you can select from the Theme Variants on the right on the home screen as Tarot Forum Classic. I realise it isn't the complete look of the old forum, but I hope this will be a suitable solution for those of you who preferred the older scheme. In your user control panel you can set it to be your default theme.
Sorry, would if I could, but can only affect colours and header background for theme variants, and for whatever reason, I can't make the red squares change for the life of me or I would have changed them on the modern page. I even contacted the theme author who sent me some code to try, but sadly, no luck.
The Tarot will lose all its vitality for one who allows himself to be side-tracked by its pedantry. - Aleister Crowley