Had the privilege of framing a Thaddeus Welch (1844-1919) oil painting a while back (
here). Took a very different approach with this one, playing up the wonderful tradition of Taos frames. Trevor Davis had made a corner sample similar to this, and when the painting came in, the design, with a couple of adjustments (scaled down, made as a flat rather than a slope), would be just right. This is a 3-1/4" wide compound flat profile with carved corners, in quartersawn white oak with Medieval Oak stain. The painting's about 12" x 14-3/4".
Here's a detail of the corner: