Make a poster from your favorite beach photo, or purchase a beach poster (or any outdoor theme you prefer) then frame it with an re-cycled window frame. Makes it appear that you are looking out a window. Love this clever idea!
Cover the soil with beach sand and start designing your little piece of beachfront property. Place sea treasures here and there, and I think a Beach Dune Fence is a must. It defines the space so nicely.