Quite often in our moulding store someone buys stock for frame projects. Look through some one-line moulding stores, you can get many different styles, even some with the rebates already made.

Make the shadow box, cut the 45 deg's corners "poof" done.

http://www.altereagle.com/

http://decks-ca.com

http://kingofcrown.com

Alter Eagle Construction & Design