While I am not sure “reclining grass people” were created, seems to me that you could buy used mannequins for this project. We have lots of distressed and cheap mannequins in our “mannequin boneyard” (available to SF Bay Area customers only.

For more ideas on using mannequins in the garden, see our Pinterst board on garden and flower shop displays.
Visit our website to shop for mannequins and dress forms, rent display pieces, or recycle your old mannequins.