frosting an led, how?

While in the process of constructing my dash vent cover, I noticed that my warning lights are super bright LEDs, which will act as more of a flashlight in my car. I need to frost the bulbs somehow so that they don't shine light everywhere, but just light up like a warning like should. How can I frost the bulbs, preferably using something I may already have. I want to avoid sanding them because when the light is on you can see all the swirls and sand marks, I need a nice uniform frost on them. I was considering just shaving the round part down flat, but I don't know if I really want to do that either. I also tried dipping one in various solvents hoping it would leave a frosty finish........ it doesn't. Any ideas to get these little puppies frosty?

just lighly sand it use a scottch brite until it gets a foggy look

Kevin, replacing them with bulbs.... NOT gonna happen..... the holes are specific for LED bezels and LED's. I just wanna frost the "bulb" so the actual light itself will appear to light up more..... it can throw light where it wants, but I need it to look more like the bulb itself is glowing a little, not just shining light out. no_joke, I tried using some sandpaper, but it leaves marks that are noticeable. Frost spray isn't a bad idea, but I was hoping to do more along the lines of free :) I might try with a really fine sandpaper instead.

A higher grit sandpaper should do what you are trying to do.  Or try a fine nail file.

 800 to 1200 grit sand paper..Jeff