I recently completed this Birch Bark frame for a customer of ours. I made the base of the frame out of rough cut Pine and stained it dark. The corners are at 45 degree angles and joined with biscuits. The customer wanted as much Birch Bark as possible showing on this size frame. In this case I used 1/4" dowels instead of twigs so that more attention would go to the bark and not to natural shaped twigs. I stained the dowels and attached them with brass head nails. It is a great match for this Owl photo and matting.