Cut a ½-inch thick plywood backing to the size of the painting. This backing will give the painting stability no matter the material used to paint on, and will keep the painting flat against the wall when hung.
Glue the painting to the foam board or plywood using the appropriate glue for the painted material. If the painting is on cloth use fabric glue, whereas paper requires white glue and wood requires wood glue.
Place the painting against the wall to see if it really needs a full wood or metal frame surrounding it. As many of the Madhubani painters use every inch of the material to paint on, you may not want any additional frame except the plywood backing. Nail a small hanger to the back of the plywood if this is the case. Hang as you normally would.
Glue the painting either to a ½-inch thick piece of plywood the size of the painting, or glue a piece of foam board to the back of the painting. As you will use a traditional frame, you don’t necessarily need the strength and stability of a plywood backing. Use glue that is appropriate for the painted material.
Find a wood frame that works with the colors in the painting. Place the frame with the back facing you on the work table. Insert the painting with the foam board or plywood backing. Because this type of painting -- even with the added backing -- is not as thick as a canvas, you can frame the back much as you would a print or watercolor, except you don’t need to use a front glass.
Insert framing nails into each center of each side of the frame back. Hammer lightly in place with a small framing hammer. This will affix the painting in the frame so you can insert the rest of the framing nails.
Tap in a framing nail every ½-inch distance from the previous nail. Do this on all sides.
Cover the back of the frame with craft paper and tape around the inside edges of the frame covering the nails with framing or masking tape.
Screw in a D-ring or triangular metallic fixation on each side of the frame about 4 inches down from the top of the frame. Insert frame wire in each D-ring or triangular metallic fixation, creating the painting wire hanger. Do not stretch the wire too tight, but instead leave it slightly loose, allowing for better hanging.