This gold fluted frame is being used to frame some 3D objects, which means an extension needs to be added to accommodate the extra depth required. There are a number of ways of doing this, you could use a bevelled box made from mountboard, another moulding 'cap' could be put round the side, but in this case I am using a plain wooden moulding to create the extra space.
This wooden backing frame could be finished in various ways; it could be stained a wood colour or painted in a traditional colour like yellow ochre (often used on the sides of antique frames), it could be given a gilt finish to match the sides of the frame, or you could just finish the sides of the wooden backing frame with brown paper tape. All of these finishes look neat and tidy, and the sides of the frame are rarely viewed directly or face on.
In this case I have simply taken four pieces of the same moulding as the frame, and just cut the side off the moulding, so that I have a flat section 1/8" thick, which is then glued to the sides of the backing extension.
