Came across this framing software and find it pretty cool for basic determinations as to thickness, color, etc with your own work. Limited to under 3MB for the picture so quality is not high, but figuring out what works is great.http://fslj.larsonjuhl.com/default.aspx?frameid=887184&fwidth=4.0000&site=0
Once you choose your painting, you then select canvas, if appropriate and then enter the width. At that point you choose upload. Once uploaded you select the frames tab and choose from the vast number of frames to find what works. Enjoy.
Here is an example from my latest painting, I think the gold works pretty well.