This cushion would qualify as plain, but only because it disappears into its surroundings. In the kitchen of my client's house this window seat adds the perfect spot to relax. The white Sunbrella makes for an indestructible cover.
Because the window seat is so low, we opted to do a thicker-than-normal cushion. Plus, the window frame stuck out enough that it helps keep the cushion in place. Even though we used white, since it is Sunbrella, stains will not be a problem.
On to the fancy...this chair, one of two, is in the sitting room of the downstairs guest room. The black and white embroidered fabric dresses up the vintage wicker chairs. The contrast welting is the white Sunbrella.
The guest room can be seen in the background. The room is predominately white with a black iron bed. A black and white duvet is folded at the foot of the bed, and ties in nicely with the cushions in the sitting room.