Making and growing grass heads is such a fun and "rewarding" garden craft activity to do with your kids. The grass grows quickly and you get to have fun trimming it with scissors and creating fun hair styles.
MATCHSTICK CROSS There is one of these hanging in one of the classrooms at my old church (or at least it used to be there). It was a bible school craft for the older kids one year. I was too little then, but thought it was really neat.