Outdoor and Concrete Patio, Porch, Deck As Meffan was hand-troweling the concrete floor, his daughter ran in with different leaf specimens from the property, like ferns and bamboo. Meffan pressed the leaves into the drying concrete and later swept the crumbling leaves away, leaving “fossil” impressions in the floor. The floor was then sealed with a nontoxic acrylic.  Photo 12 of 13 in Diamond in the Rough (and Ready)