Stencils: I was lucky enough to come across scrapbooking overlays at Michaels this summer. Why not tape off stripes, or better yet, use LACE?
Materials: 3M General Purpose "45" Spray Adhesive. This is supposed to be the least permanent and not as tacky. You need to lay your stencil flat on the ground, on a garbage bad (to ensure no dirt from the ground sticks to your spray mounted stencil). Apply a dusting of adhesive and wait. You will need this to lose some of its tack. I waited about 30 seconds. The longer you wait the easier it will be to take the stencil off the door. I was able to re-use mine twice before it got grubby or I got tearing.
Rustoleum Specialty Frosted Glass. Once your stencil is placed on the inside of your door, spray away. Work about 6 inches away from the glass to ensure an even coating, extending past the edges of the door (make sure you tape these off). Wait about a minute and repeat until you achieve the level of opaqueness you want. I went with two coats.
****The key here is that you need to SHAKE, SHAKE, SHAKE this can. I did not do it as much and the first door came out a little gritty. The application got much smoother on the subsequent doors. Also, this stuff WILL stratch off. May be good for mistakes, but be careful after it dries.******
Now, make sure you take the doors off your unit and tape off the perimeter. Then, spray away! This is how the glass looked with one coat.
I hope this helps. There have been some questions whether the remotes work thru the glass---YES! That's the reasoning behind the frosting and using the stencil. It's opaque, but not too much.
Please email me with any frosting projects you do yourself and don't hesitate to comment back with any questions!