Here is a fun project you can do with kids to help teach graphing. My son's class works on these if they have a little free time between subjects.
I am sure you have seen these. It is a simple graph that breaks the graph down by row and column and then has the students color using the key.
If you are interested in doing something like this with your class or home schooler there are several free hidden graph pdf.'s available online or you can order them here by age. Some of the books come with seasonal graphs for the different seasons and holidays throughout your school year.
Have fun graphing.