A kitchen this pared back can take one serious mustard yellow. Blue wildflowers sit thick and painterly in a blue and white jar, with a deep red tabletop grounding the whole thing. The room shifts the moment it goes up: warmer, more lived-in, a bit braver. Hang it above a sideboard, console or kitchen counter where you want a real shot of colour. It works with timber, rattan, terracotta tiles and blue and white china. Avoid pastel walls and very cool greys nearby — they will fight the yellow. A black frame keeps the brushwork sharp.