Firstly, I want to share with you some of the videos which are suitable for children(claymation or stopmotion:
http://www.youtube.com/watch?v=Z-rqVUx0S_A
http://www.youtube.com/watch?v=AL_c_QM4dNc&feature=related
http://www.youtube.com/watch?v=84WqmTgC9w0&feature=related
http://www.youtube.com/watch?v=I9dc8GNsoDQ&feature=related
http://www.claykids.com/videos.php?tr=1&play=0
Secondly,I think, these videos are more suitable for younger rather than children:
http://www.booooooom.com/2012/06/28/no-noodles-stop-motion-animation/
These are horror ideas with claymation:
http://www.youtube.com/watch?v=6d-tNXxTRBA&feature=related
http://www.youtube.com/watch?v=48NfBfA_6NQ
http://www.youtube.com/watch?v=qxVGGkO30Eo&feature=related
I also found a video series for Mario which you can define the action and the continuity of the video:
http://www.youtube.com/watch?v=XJaFyHSUD60&feature=autoplay&list=PL094B854A816143F6&playnext=1