Something like this might work?
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+20024+15485&pcatid=15485
Just place it around the trim but facing inside. I've done this with plants before...
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+20024+15485&pcatid=15485
Just place it around the trim but facing inside. I've done this with plants before...