not light bulbs, but those round, glass ones. if you plan on doing this, you will need to hitail it to a craft store. (i found mine at Target last week.)
you need acrylic (permanent) paint
clear glass bulbs
cut-up straws (about 1/2 to 1/3 length)
egg carton
take short straws (to use as droppers, but droppers would be hard to clean!) and drip 2 different colored paints in a glass bulb (after taking that stupid silver thing off top). swirl the paint around to get marbled effect. *i like to have gold and silver paint and suggest that students do one metallic and one bright color.*
turn globe upside down in egg carton to dry overnight--put silver thingy back on the top.
this is quite easy to do and quick. the only hazards are the paint and the glass.
oh--the reason i suggested you get to a craft store is to get the bulbs before they disappear--i have a hard time finding red pom poms (rudolph noses), clothespins (rudolph bodies), orange pipcleaners (snowman noses), etc right before a holiday because everyone else is doing the same crafts!