The Bulbcap is like tights for your naked light bulb. It is a sort of peelable lampshade. You can pull them over lightbulbs that don't exceed 40 watts in rating although there is no limit for economical ones.
The Bulbcaps are made from heat resistant silicon rubber which comes in several luminescent colours. The luminescent caps contain special pigments which will still glow for a while in a greenish-yellow colour after the light has been turned off. The Bulbcap costs just $20 each.
Great for those who don't like fussy lampshades but like to mix and match colours in a decor.