"Foldforming" by Charles Lewton-Brain. This book is full of exciting forms and ideas by the man who discovered the concept. The earrings I listed in my Etsy shop are very simple ones done by foldforming. They were cut from copper sheet, folded, shaped and textured. They were then annealed to soften the metal so the fold could be opened. The beautiful patina is a result of the annealing process. The earrings were completed with my own lampwork beads and handmade sterling silver ear wires.