Pretty easy set a Canada Flag about 3' behind the blade of grass spay grass with water focus on the water drop and presto the refraction of the flag comes through then rotate image so Flag is right side up
My set up was
Nikon D7200
Tameron 90mm f2.8 Macro lens
Nikon Sb700 flash with diffuser set at TTl
Yongnuo Flash off camera to light the Flag
Yongnuo 603 Flash Triggers
Stand and clamp to hold the blade of grass
Spray bottle to mist the grass