I know crayola has their nifty color bubbles on store shelves now but I prefer making my own. They clean up so much easier and make nicer bubbles.
I like using baby food jars but you can store them however. Just pour bubbles into jars, add paint, stir and have fun.
Now to take this further, kids can blow the bubbles onto paper and it makes great artwork. I like to use solid white wrapping paper and let the kids wrap their friend's presents in their art :)