Make lots of cards with green things printed on them.
Pin or tape one on each players back.
Players try to guess what they are by asking questions that can only be answered "yes" or "no".
When guessed, the card can be changed with another.
Some examples are emerald, avocado, shamrock, frog, beans, lime, kermit, etc. We are sure you can think of more!!
Used by permission from Guidestuff and Green Machine, Nov.1986 no.81, Green Week Issue