You could show a music video or Youtube clip.

Another week you could teach them an Idiom.

You could also do something requiring movement, like clapping their hands while chanting the line.

Another week, maybe focus on rising and falling intonation.

You could focus on 1 phoneme per week and teach them how to pronounce the letter and a tongue twister to practice all week.

You could also teach them a sentence a week using a children's nursery rhymes/song CD. Every time the singer sings the sentence, you could press a button to make the sentence appear on a powerpoint slide.