Place 2 stair blocks side by side for the seat
Place 1 stair block behind each seat block for the backrest
Add slabs on top or in front for armrests
Use matching blocks for the sofa frame
Add carpet or trapdoors on top for a smoother look
Use any color wool, concrete, or terracotta for the cushion style
Place signs or banners on the sides for extra detail
Add buttons or pressure plates for small accents
Build the sofa length by repeating the seat and backrest pattern
Place the sofa against a wall or in a living room area