I am guessing that a section of rain gutter would not be appropriate? Home depot has a PVC crown molding that looks very nice, I have this in our lanai. There are several sources for the PVC crown molding, a Google search will get you additional information. The reason I suggest PVC is that any iron based may rust in the future, and aluminum based can be very difficult to paint (special techniques, primers, etc.). Also, if you are just looking for a simple flat piece, mounted at an angle, you might find a piece of vinyl siding, with 2 or 3 angular supports.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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