What you need:
-a set of champagne flutes - these are from a set of four from walmart. They were left behind by our old housemate, but even if i had bought them, i think they would have been 3 or 4 dollars.
-puff paint - also known as dimensional fabric paint. Color doesn't matter, and I'm pretty sure I used a cheap version. Name brand would be something along the line of Tulip.
Step 1: Pick a Pattern
I googled "toast and toaster" to find an image to etch. You could do this with any image that has distinct lines. Once you have your pattern picked out, print it and check the sizing against your glasses. If it's too big, scale it down and reprint. If it's too small, scale it up and reprint.
Step 2: Prep Work
Before doing anything else, wash your glasses thoroughly. Using the painters tape, tape the pattern inside the glass.
Once you have the pattern taped inside your glass, use the tape on the outside to tape around the pattern, then using the puff paint, paint everything within the tape that isn't the pattern. I started by going around the edge of the pieces of toast and the toaster, then going back to fill things in. This is a little difficult on the glass due to the distortion from the rounded edge. I had to keep an eye on the thickness of the lines, and be aware of what the final picture was supposed to look like.
Step 3: Etch Your Glasses
After 10-20 minutes, rinse the etching creme off the glass under warm water.
Step 4: Finishing
After washing all the creme off, peel off the tape and puff paint and remove the pattern from the inside of the glass.
Finally, dry the glass and admire your work!