Here is an idea from Christy's Clipart.
 

(Credit Unknown) First line is "Keep the commandments".  For motion I did the McDonald's arch (two fingers in the middle drawing an M in the air, as if there is someone out there unfamiliar with McDonalds ha!) symbolizing the two tablets Moses carried with the 10 commandments engraved on them. I asked is it the McDonalds sign? Of coarse not, but it helped them to remember.  "In this there is safety"... For motion I did arm across the chest like a crossing guard's sash or showing protection.  "In this there is peace"...For motion just a peace sign. "He will send blessings"...For motion I did hands overlapping each other like a priesthood blessing but started high with my hands as if Heavenly Father sends blessings from above to us below.  "Words of a prophet"...For motion just held my hands to my mouth, pointed to a picture of the prophet on the wall.  "Keep the commandments. In this there is safety and peace."...Same motions as before.  Simple and easy, added another reverence song into our repertoire.
 

Sing “Keep the Commandments” (pp. 146–47). Give each child a piece of paper and a pencil or crayons. Have them fold the paper into four sections. Ask them to draw pictures of four commandments that they could keep (see “Drawing Activities,” TNGC, 166–67). To give them ideas of what to draw, have the pianist play several Primary songs about specific commandments, for example, “Baptism” (pp. 100–101); “Search, Ponder, and Pray” (p. 109); “Follow the Prophet” (pp. 110–11); “Love One Another” (p. 136); and “I Want to Give the Lord My Tenth” (p. 150). Allow the children to share the pictures they have drawn. Explain how having faith will help them keep the commandments.  (Suggestion from January 2007 Friend Magazine)