I was helping with a section from my circuit who were having a day at one of my churches. The theme was rainbows, so I offered to have an activity making Stained Glass windows using glue and paint. 

 
Just letting the creativity go using PVA mixed with paint on acetate. 

 
Once it starts to dry if you paint over again just with PVA once or twice, when it is dry you shoul then be able to peal it off and should stick to your window giving the look of stained glass. Might try next time having a layer of PVA already dry on the acetate and see if the process is quicker, as it can take a day or two to dry…