>>11587091With castles you can complement the grey with colorful roof tiles, green grass/trees, different colors of wattle and daub sections, any color flags and banners, any color painted window frames, doors, and wooden railings. There's also the possibility of making non-gray stone walls (eg black, white, tan).
But of course Lego decides to use ugly straw thatching, plain white daub, and generic brown wooden doors for the LKC.