Microwave surround in cabinet. Help !!

I am currently working on modifying my kitchen and have moved my undercounter oven into a tall housing unit (with no problems) the issue I have is that our current microwave is too good to get rid of and replace with an integrated one.
Has anyone any ideas I could use to fit some kind of housing surround around the microwave so that it doesn't look like it's just been stuck in the cavity above the oven ???