DIY :: Tinted Mason Jars :: apply mixed food coloring and Gloss Mod Podge. 10 min oven bake (For decoration only, Do not use them for food http://www.momtastic.com/diy/168908-diy-tinted-mason-jars-in-rainbow )
Recycle glass bottles - Mix water, glue, and food coloring, coat the inside of the glass jar, then turn it upside down to dry for 1 hr. After that, leave it out to dry for 2 days (instead of baking it)
DIY Tinted Jars. These colors are gorgeous. Something to finally make with glass jars instead of throwing them away!