i took the plan of salvation maze from these conference packets - http://simple2url.com/GeneralConferencePackets
the maze is in the senior primary version. love these packets.
allow the kids to color while they listen to the lesson. you can ask the to color the part you are talking about, what do they think it would look like? you can color your own version too. i think it's less of a lesson when you are just "coloring together". then you can cut them out after explaining it and ask them to put their version in order.
some other ideas would be cut out some large puzzle pieces and let them glue their artwork to the puzzle pieces and put their puzzle together over and over. we are gluing it to a strip of paper and hanging it up.
a few more references -
this is another version that looks like they have cut out a person and are moving the person through the plan. you could also use a picture of the child to move through the plan. if your family is dealing with a friend or loved one passing away, use a picture of that person. you could do a lot of role play with pictures of family past and present to show how we all move through the plan at different times but all end up in the same place together. the second link has cut outs in color and black and white to represent the body and spirit. this concept could be used with family pictures as well to show that the spirit is still alive, just separate from the body.
the official church version -http://www.lds.org/friend/1994/03/sharing-time-the-plan-of-salvation-offers-me-peace?lang=eng&query=plan+of+salvation