Here's a sample of some 1st semester 1st grade collages. My big push for collage was constructing something new, not just gluing down pictures you like. That still happened sometimes, but I did see some glimpses of kids "getting it" and starting to combine images and shapes to create something different.
There's also lots and lots of mixed media happening. It's a lot faster to color a background than to collage one so it happens frequently.
Not many students tried just construction paper, but I really like the example below of a student who did!
In the last week or so I've been talking about Eric Carle and how he created special papers to use in collage. I'm excited to see what comes out of those explorations!