I recently had the opportunity to test out and review the Coverplug. This is a really fantastic product, it has pegs on the back that plug into a typical three-hole electrical outlet. It's completely flat against the wall, so little fingers can't take it off...if they even notice it's there. It painted really well too. We just painted the living room, so this was good timing for us! 

This is what it looks like out of the package, plain white, plastic. I wouldn't mind using it just this way, honestly.

Here's the back, you can see the pegs for plugging into the socket. I love that this takes literally seconds to install and doesn't do any damage to your walls or outlets, and is as easy to remove as it is to put in.

And here it is on our freshly painted wall! It blends in quite well and looks nice and neat. 

They're fairly inexpensive at $8.50/2 and they look a lot better than the individual plastic plugs you can buy. My only suggestion is that they would also make one that can be used in two-hole outlets, as that's what several of ours are! Overall, five big hearts from me!

Here's what the Coverplug people have to say:

The COVERPLUG™ is a durable, molded, and paintable plastic panel that plugs right into a standard, grounded, double electrical socket to cover the entire outlet. This innovative outlet cover is held securely in place by posts on the back that align with the ground openings and require no tools for installation or removal. They are made in the USA and use a specially designed plastic that is easily paintable to match your wall color. The COVERPLUG™ is an excellent child proofing product.
The COVERPLUG™ serves two main functions:

  1. 1. Creates a physical and visual barrier between your family and electrical outlets.
    2. Covers unsightly outlets and makes them virtually disappear!
For a safer home and seamless walls, the COVERPLUG™ is the only option!

*I received this product free in exchange for an honest review, all opinions are my own.