We just came across the artwork of Anne ten Donkelaar on Pinterest. She makes the most incredible 3D collages using pressed flowers and pictures of flowers that she cuts out. Many are re-creations of true flowers, but often she creates new flowers from her imagination. Each one is then meticulously pinned into place and an amazing piece of artwork takes shape.
Many more of her flower creations can be seen on her website as well as other pieces of her work. Go look, and be inspired!