How can I decorate/cover an ugly air vent return?

I have used decorative magnets before.

Do you have room to put a small table or desk over the vent? Maybe a coat of paint closer to color of wall.

What if you did something like this

https://pin.it/xulcsneytpfvoh

I used a wooden decorative wall plaque that is open enough for air flow.

I would start by painting it the same color as the wall so it at least blends in more.

You might check out "decorative metal sheets" at the Home Depot or Lowe's websites. They come in a few designs and colors that are definitely nicer to look at than the open louvers on your return vent - plus easier to clean! I'd just pop it over the top with a few metal screws.

Can't block or cover it. Paint it the same color as the wall. Place a small table in front of it. Nothing much you can do.

Hi Susan, here are few ideas you can try to hide or camouflage that aircon - https://hvac.ninja/articles/hide-outdoor-ac/

There is a reason why those vents are designed like that. Nothing should be above, to the sides or in front of it or you will block the air flow, nor should they be covered with those fancy decorative metal grilles, still will block the air flow, even when they have openings.

You will be forcing the AC unit to work harder and can break t down faster.

Only thing you can do is either paint it in a contrasting color or the same color of the wall.

There is a reason why those vents are designed like that. Nothing should be above, to the sides or in front of it or you will block the air flow, nor should they be covered with those fancy decorative metal grilles, still will block the air flow, even when they have openings.

You will be forcing the AC unit to work harder and can break t down faster.

Only thing you can do is either paint it in a contrasting color or the same color of the wall.

Paint it or find a vintage decorative grate to go over it.