I am fairly new to the game and not sure if this has already been done, but I would enjoy a HYGGE theme.
It could include Scandinavian recipes like Valhalla Brownies, Almond Crown Cakes, Sourdough Loaves, Krumkaker, Kaffe, etc.
The decor items can showcase cozy Nordic minimalist designs with natural wood materials, clean lines, and restrained color palettes. Even a bolder, IKEA-inspired collection would be cute! I envision some nice window options, fireplaces, plants, and candles.