what can I make with unused bunk bed material
What kind of materials do you have left over and what are the lengths?
Make some outside raised grow boxes.
You could build some extra shelves, build some storage cubbies or even build open top flatter cubbies for under the beds. What about a stool for climbing into the bed. Maybe with multiple levels???? Or create a shelf to be attached beside the top of each bed like a night stand. Ask yourself, "What do I need?" That might help you figure out the best use of the material you have left. Wishing you the best.
It depends on what kind of material/wood you have left over. I love scrap wood projects since you can make so many things with them. I have made Christmas tree ornaments, Wood Lanterns, Utensil Caddy. Put hooks on a piece of wood and use it to hang/store items on the wall, make picture frames, wood signs, wood crates. Here are some ideas.