If the cold air return is no longer being used, then remove it and close it up with 1/2" plywood and some backing material. If it is being used, then there is nothing you can do but paint it.
EDIT: You could wallpaper over it, but that is going to look like the projects or a trailer park.
Couldn’t you wallpaper it the same way you wallpaper a wall switch?
Just use more paper and cut out all the slots like you cut out the switch opening. Just make on "X" in the center and bend the paper in and around the openings.
Wait, that wouldn’t work…
You’d have to cut out the openings with a sharp razor.
Another option would be to sand it and spray paint it to match the wallpaper.
usually you can remove the vents easily by taking out the screws holding it in place. Then you can get a nice finish on the paper by wrapping it into the vent hole a little ways. Also gives you a chance to wash the vent!
If the cold air return is no longer being used, then remove it and close it up with 1/2" plywood and some backing material. If it is being used, then there is nothing you can do but paint it.
EDIT: You could wallpaper over it, but that is going to look like the projects or a trailer park.
Couldn’t you wallpaper it the same way you wallpaper a wall switch?
Just use more paper and cut out all the slots like you cut out the switch opening. Just make on "X" in the center and bend the paper in and around the openings.
Wait, that wouldn’t work…
You’d have to cut out the openings with a sharp razor.
Another option would be to sand it and spray paint it to match the wallpaper.
Try painting to match.
usually you can remove the vents easily by taking out the screws holding it in place. Then you can get a nice finish on the paper by wrapping it into the vent hole a little ways. Also gives you a chance to wash the vent!