Do you have the book comprehension connections?? There's a whole chapter about visualization, and it's AWESOME! I'm starting visualizing next week...I'll begin by introducing what it is, and how we describe what we visualize, discuss thinking stems to use while describing what they visualize and put on an anchor chart.. then I'm going to have students close their eyes as I describe a setting to them (walk through the woods, beach, etc) We will talk about what we saw while we were visualizing and how everyone had different thoughts. You can also discuss with students why we visualize while we read.
Other activities to use- put things in paper bags that students need to smell, hear, touch, etc. and have them describe them. Read a poem aloud and have students visualize what they saw. Pull up an optical illusion and discuss what you see. Listen to different sounds and talk about what they visualize when they hear them.
I also found this website to be useful, it has some books to use for visualization
http://www.mauryk12.org/Literacy/rea...or%20texts.htm