03-04-2009, 09:30 AM
You might try scoring some matching mortar lines into the wall using a razor saw, or a blade. I can't see exactly how the mortar lines are formed in the rest of the wall, but you'd need to pick a method that would give you a matching pattern.
Another alternative is to make pilasters with the mitred corner to cover.
Andrew
Another alternative is to make pilasters with the mitred corner to cover.
Andrew