Toodling along with interior trim.

I have figured out what to do with those unsightly rough archways-- cover 'em up with a something-or-nother! I don't know what you would call it... I will probably put some white trim around its top and sides though. I will apply some spackle to the trim to take care of rough joints and interfaces, then some paint here and there, and then seal it to give it some sturdiness...