If you don't want to fall victim to a RAT, a webcam cover is a necessity. However, many of the webcam covers available on the market are not aesthetically pleasing.

Enter Cloop. It's made of two magnets held together by stretchy silicone and is meant to be used as cable tie. It works really well as a webcam cover too. Just place the two magnets on the opposite sides of the screen and over the webcam.