Believe it or not, you start working on a glass dish with a folded towel. The dish is scooping inward and the paper pattern is flat. After you tape the pattern on RIGHT SIDE DOWN, on the right side of the plate, you will need the towel to push the pattern up against the glass.
Now it is ready to start drawing on. But realize that the pattern is still not directly at your pen's tip. You have the thickness of the glass to contend with.
Another thing to consider when the ink hits the glass...because the glass is not absorbent, the ink will leave a tiny dot of residue. As you do your pattern, try to lift the pen as little as possible and keep going. For example: when doing Socc, instead of drawing each line on each side separately, make one long circle around and around as many times as you want it thick. Hope you understand what I mean. It will be more obvious when you actually work on the glass.
When I am finished I cannot write the warning message that it is for decorative use only, as it would show. Also, as the ink is on the bottom of the dish, these could actually be used to serve cookies, or the like. They still need gentle washing, though. The ones I plan to sell will have to have a card attached that explains the rules about use and care.
Now you can take a look in your cupboard and see what you can Zentangle first!!!
Here is an addition to ways to Zentangle on glass
These are glass cutting boards/hot plates. Picked them up at the "dollar" store (for $1.00) I taped the design on the top, upside down, and turned it over to trace the design on the bottom. I used the ink I had chosen right from the start. No need to use pencil as you can see the design clearly for tracing.
When I was done, I put a bit of vaseline on the little feet used for protection on the plate. Then I spray painted with an enamel can of white paint. It covers the black ink, and gives it a background color, so that when you put it on your counter, your design is easy to see.
When the paint is dry, carefully wipe off the little feet and they will be clear. I found out the hard way that the paint won't stick to them, and it came off on my counter the first time I put the board down. It also doesn't stick to the vaseline and wipes off easily and your board is ready to use.
Here is a photo of the plate actually on my counter next to the pizza cutter to show you size relationship. It is meant for small cutting jobs.