Cover up an unsightly air vent with a rubber doormat. Even easier, just put in two hooks over the vent and hand the doormat. Make sure the holes in the doormat are large enough to let air flow through.
Air vent covers, can include 'air flow regulators' which mount behind vent covers. The regulators mount independently of the vent cover and operate with a key, but in some cases you may need to remove the cover.
"I WISH I had floor vents just so I could do this," said a reader when she saw this clever trick:
Inexpensive craft store frames fit perfectly around light switch covers! --I like the LOOK Expensive (but not really BE expensive! -- 31 Easy DIY Upgrades That Will Make Your Home Look More Expensive--
Make your baseboard more dramatic.add small pieces of trim to the top of existing baseboard, add a few inches and add another piece of molding. Paint the wall and trim white. This also works for crown molding too! <-- or fake a baseboard altogether