Viola! A grid!
Note, you will make a huge mess with this chalk so either put down some tarps or move everything out of your room. Either way, plan for some clean up.
I strongly recommend you test on your own ceilings to see what works/doesn’t cause damage. This is what worked on our plaster ceilings but I can’t say for sure it will work on all ceilings.
The contact paper I went with is definitely more reflective and stainless steel looking than the pretty metallic of the stars on the original wallpaper but I was willing to deal with it for the savings. I lucked out and got all the contact paper I needed on eBay for $26! Definitely check there and also check Walmart and the Dollar Store.
Keep in mind as you work that not every single intersection gets a star. The stars are laid out in a brick pattern so only every other intersection gets a star. This is best illustrated in the image below I think. The red dots represent where a star goes. Notice that there are grid intersections that don’t get a star. Just skip every other intersection and you’ll be fine.