These are plastic covers that fit over standard "ovalish" electrical outlets in the US. We remodeled our basement and these just didn't fit our style. They're bigger than regular electrical outlet covers but kinda neat in a 70's patriot style. I haven't seen anything quite like them before. I don't know much more about them but ebay AI says this:
Add a touch of vintage style to your home with these FOUR (4) Colonial Eagle Federal outlet covers. Designed with a hammered metal finish and a simulated wood appearance, these outlet covers are perfect for adding a unique touch to your home decor. The covers are made of durable plastic. With two outlets per cover, they are suitable for any wall and application. Made in the United States, these covers are a great addition to any home improvement project.