I can make homemade alcohol ink by soaking the insides of dried-up magic markers in alcohol, or by adding food colour to alcohol. (Other people have used fabric dye or Kool-Aid powder.
DIY Alcohol Ink Glass Gem Necklace You know those big bags of flat bottom glass gems at the Dollar Store? They are commonly used in vases, but crafters use them for magnets and jewelry. You can use alcohol inks on non-porous surfaces. From Tim.
How to Use Alcohol Ink on Glass, variation: drip from bottom down for stem look, then drop colors for flowers and blow air for splattered flower
Alcohol Ink Art - Dreamscape No. 7 by June Rollins