The 1995 September Friend Magazine Sharing Time by Susan L Warner has
an illustration of
an oil lamp,
oil drops,
and a oil jug for extra oil
by Jerry Harston.
Go to LDS.org and search the Friend Magazine to find the illustrations.
This is a nice way for kids to see how their every day actions of personal righteousness are preparing them for the Coming of the Savior. I took the illustrations and enlarged them and had one for each child, having extra drops for the kids so they could list what they did each day to fill their oil lamps.
I had mine posted in our Family Room for some time on a poster board.
It would have been better had I posted it for a limited time, say two weeks, and then had the kids report on how they were doing.
I recommend using only Sharing Time ideas from past Friend Magazines, at least one year old. You don't want to spoil the kids' time in church or FHE by having something done more than once.