For certain songs which are easy to illustrate, it's fun to have the kids help with the illustrations. I did this with Beautiful Savior. I wrote the first 3 lines of the song on pieces of construction paper and handed them out to each class. I gave them some crayons and a few minutes to illustrate the words. For the younger classes, I had the teachers draw what the kids told them to so it wouldn't be chaotic. The older kids were able to take turns and all contribute to the picture. Then I used their pictures as my visual aids in teaching the song. Here's an example, the first line of the song "fair is the sunshine."
You could also have a child come up and whisper in his ear the words to the song and have him draw it with chalk on the chalk board and have everybody else guess the words.