Heather, I have my children "write" music as well as read it with their bodies. We play what I call the "Composers Game". I have four pieces of construction paper numbered one through four (using stronger colors for 1 & 3 such as red, yellow and weaker colors for 2 & 4 such as blue and green). Choose the meter to write in (I start them off in 4) and lay out the "beats" across the floor. Choose a "composer". The composer then chooses people from the class and turns them into musical notes. My only rule is that when it is eighth notes, it has to be two people of the same gender so they don't get silly "linking up". The composer puts the notes on the beats.
For instance, he may say, "Joe, you are a tah (quarter note)" and he puts Joe standing straight and tall with arms to his side behind beat one. Jane and Jill, you are "tee tees" (or whatever you say for eighth notes) and puts them on beat two. They have to link their bodies together...across shoulders or link elbows if they prefer. Then he might say "John, you are a Two-oo" (or whatever you say for a half note) and John stands with one foot behind each of beats three and four. The class then claps the measure "tah, tee-tee, two-oo" and I put it on the board. Then we read it from the board (clapping or on instruments). I say, "What do we need?" and they chorus, "a bar line!". Then Joe picks a girl to be the next composer. We continue the game until we have 8 measures and then they decide on either a repeat sign or double bar line and we read the entire composition. (FYI, a whole note is one person who has to lie down across all four beats. A rest turns sideways, gets on knees and sticks arms out like a Z). Even my first graders can compose like this and first through fifth all enjoy the game.
Later pitches can be added to the game. I use body positions rather than Kodaly hand signs. So is on shoulders, mi on waist, do on knees, etc. The composer tells each note in the rhythm what pitch he/she is and they take that position. Then the rest of the students can sing the measure. The notes can be transferred to the staff (I use auto striping across my white board) or the rhythm put up with the names or initials of the pitches under them.