Usually, I do not design the frame until I have completed a painting. Sometimes the painting will inspire the items used on the frame or the items are chosen at random to create the best design. From experience, I find small lightweight toys and objects work best. If an item is heavy I will secure it to the frame. For the most part, the items are arranged and placed onto the frame covered with texture paste. I buy white Texture Paste at Nova Color. Before spraying the frame with Montana Gold spray paint, I use masking tape to cover any items I do not want painted then gesso everything and allow to dry before spraying. Work in a well ventilated area with the Texture Paste. I only use the spray paint outside. Avoid working in humid conditions. Also, do not allow pets into the room when the paint is wet!
Gesso is available at many art stores