This is all you need; Mod Podge (I've heard regular Elmer's glue works just fine but I personally have never tried), whatever kind of wallplate your decorating (I got one for 73 cents at Walmart), Glitter (99 cents at JoAnns) and a paintbrush.
1.) Spread the Mod Podge all over the wallplate, don't worry about it being neat or perfect. Be careful around the screw holes though because you don't want it to be covered in glitter and not be able to screw in the wall.
2,) Sprinkle the glitter all over the wallplate, be sure to cover all the mod podge.
3.) If you want more of a bolder brighter glitter color, let it dry for about a hour and repeat step 1 but apply right over the glitter instead of directly to the wallplate.
It will look like this after another coat of glitter.
4.) Once you get all your glitter on, you need to secure that glitter so it doesn't make a mess all over your house. You can do this by, once again coating another layer of mod podge.
5.) If you want to have your screws covered in glitter it's completely up to you. How I found is the easiest way to go about that is to go ahead and cover your screws with mod podge and glitter (one coat is plenty).
6.) Once you go to hang the wallplate you can peal the glitter that is covering the screws right off. Go ahead and screw them on and then place a very small amount of mod podge on the circular glitter pieces that you just pealed off and cover the screws with them. I do suggest waiting at least 12 hours before you apply your outlet or light switch covers to the wall. It might appear dry on the outside but because there are so many layers, the bottom layer might still be wet and that will cause the glitter to shift while trying to place it on the wall. Your finished product should look like this.