Check out another DIY return air grille solution here. Do you have a baseboard return air grille that looks like this?
an ancient farmhouse shed becomes a cottage style guest room, bedroom ideas, home decor - Gardening DIY Life
How to use rusted sheet metal throughout your home.
Put metal on walls behind sink. DIY Projects with Letters & Lot's of easy tutorials, including this laundry letter project from 'Lolly Jane'!
Basement laundry room with rustic tin ceiling, industrial light and clothes rod.
sheet metal wall covering - use this idea somewhere in the basement
DIY riveted sheet metal magnet board--perfect for a study area!