The easiest way to duplicate that would be to make the green picture frames and paint them with latex paint and allow to dry. Then sand by hand with fine sandpaper enough to have sand through spots. Then make the outer frame and stain it. Then assemble both together. Finally finish all of it with a water based polyurethane. The water based polyurethane will adhere to the latex paint and will remain clear and not alter the color of the green. An oil based polyurethane has a initial yellowing and continue to yellow as the finish ages.