How to warm up the front of this cold house?

A big family just moved into their Grade II listed Georgian home 7 months ago, and the front still feels really cold. Major renovations are out – they can't change the original design. So, no tearing up the patio for grass. Thinking plants in pots could help, but what kind? Any other small, allowed ideas to freshen things up? #CurbAppeal #DesignDilemmas #GardeningTips #Gardening #HistoricHomes #HelpNeeded #HomeDecor