Picture Frame Moulding
Picture frame mouldings are readily available from local suppliers. Picture frame mouldings can be bought in lengths (usually around 3m per length) or chopped to size ready to join.
Picture frame mouldings come in a wide range of colors, sizes and designs and are generally made from a softer wood such as obeche. When choosing moulding for your image make sure it compliments your image and the mat colour you've chosen.
Make sure the size of the moulding you choose suits the size of the image you're framing, both for looks and to make sure the frame is sturdy enough to support the contents of the frame. A general rule of thumb is the width of the moulding should be around a third the width of the matboard.