You can work on form and technique. Spend a good amount of time stretching. Teach them jumps if you haven't already; toe touches, pikes, tuck jumps. You can teach them forward rolls and cartwheels. You can teach them a dance.
This website has some videos of things you can teach them. it also has some cheerleading printables.
http://www.activitytv.com/cheerleading-for-kids
here are some other helpful websites:
http://aescougarcheer.com/Cheer101/YouthCheering.htm
http://aescougarcheer.com/Cheer101/StuntProgression.htm
http://aescougarcheer.com/Chants/Cheers.htm
http://www.youtube.com/watch?v=j2lV2OzS1VY
an "L stand" is an easy stunt. here's a picture and you can look up how to do it
http://www.google.com/imgres?q=l+stand+cheerleading&hl=en&biw=1366&bih=625&gbv=2&tbm=isch&tbnid=zQXS-q8TLqmfRM:&imgrefurl=http://www.cheercsa.com/group.htm&docid=GuGTpsesJN9rNM&imgurl=http://www.cheercsa.com/imgs/group/L_stand_thumb.jpg&w=213&h=213&ei=s0RqT_SZFKiEsAKXmqGlCQ&zoom=1&iact=hc&vpx=142&vpy=161&dur=2339&hovh=170&hovw=170&tx=126&ty=129&sig=103624099306957617935&page=1&tbnh=133&tbnw=133&start=0&ndsp=21&ved=1t:429,r:0,s:0