I make good faith attempts to be thematically disciplined in my garden. There was the dye plant theme, the native to Connecticut theme, the fragrance theme, the edible flower theme. All failed, infiltrated by impulse garden center purchases and other plants I just had to have! Do you have the discipline required to keep a pure garden theme? I’d love see pictures of or hear about any themes you’ve either attempted or had success with, or maybe ones you just daydream about! 
Picture of New Jersey tea in my failed ‘native to Connecticut’ area.