Take a couple of green* linen** napkins. (Note: ironing the napkins would make for a better photo, but the creases drop out with use.)
Sew together, right sides facing, around three sides. Stuff in cushion pad. Sew on three pairs of red* ribbon lengths along the open side. Tie each pair into a double knot to close cushion.
*colour choices are, of course, up to you
** fabric choices are also, of course, up to you
