1 tsp of glue : 3 drops of food colouring : 1.5 tsp of water. The more food colouring the darker the jar will be. In order to make a turquoise shade you will need two drops of blue and 1 drop of green.
DIY Mason Jar Light Directions are very good. It's easier than it appears...although I haven't made one. Pretty...and cheap. Lights are so expensive. Especially ones this big but it's Christmas lights so doesn't produce tons of light. Nice soft light.