Colored Fire Spray Bottles

In the pilot episode of "Breaking Bad", chemistry teacher Walt White performs a demonstration in which he changes the color of a bunsen burner flame by spraying the flame with chemicals. You can perform the colored fire demonstration yourself. All you need are some common chemicals, alcohol, and spray bottles. Here is a list of metal salts you can use to (safely) color fire. The chemicals have low toxicity and any smoke produced won't be any better/worse for you than normal wood smoke:

Colored Fire Chemicals

dark red = lithium chloride

red = strontium chloride (found in emergency flares)

orange = calcium chloride (a bleaching powder)

yellow = sodium chloride (table salt) or sodium carbonate

yellowish green = borax (sodium borate, a common insecticide and cleaning agent)

green = copper sulfate (found in some pool and aquarium chemicals)

blue = copper chloride (lab chemical, but other copper compounds found in algicides and fungicides may work)

violet = 3 parts potassium sulfate, 1 part potassium nitrate (saltpeter)

purple = potassium chloride (sometimes sold as a 'lite' salt)

white = magnesium sulfate (Epsom salts)

Prepare the Flame Colorants
If you were just coloring a campfire or other wood fire, you could simply sprinkle the dry metal salts onto the fire. Copper chloride is especially nice for this since the sodium that is naturally present in wood causes this chemical to produce a mix of blue, green, and yellow flames. However, for the gas flame in a burner, you need the salts dissolved in a flammable liquid. The obvious choice here is alcohol. Common alcohols found around the home could include rubbing alcohol (isopropyl alcohol) or ethanol (e.g., in vodka). In some cases, the metal salts will first need to be dissolved in a small volume of water and then mixed with alcohol so that they can be spray onto a flame. Some salts may not dissolve, so what you can do is grind them into a fine powder and suspend them in liquid.