This link is a song that younger children can sing to help them memorize the beatitudes.
It's pretty catchy and it has a nice rhythm that the children can bounce to.

Link: The Beatitudes Song

This link is a word slideshow/video presentation that can be used with older students.
I was thinking that students can take the structure on the video from one of the beatitudes and make a picture or video representation of it

Link: The Beatitudes Video