I just did a rapid lesson this week with a Fall theme. They traced 7-eight leaves (we had tracers but you could either make tracers or use actual leaves) on 12×18 white paper, outlined with sharpie and then utilized warm colour crayons to colour them. It was a assessment of warm colors, assessment of how to use a tracer, and I tied it in with the leaves altering colors in the course of Fall. I had my students paint the background then with warm colour paints but if you are on a time crunch, I would just colour them with crayons and get in touch with it a day.
Edit: I did it with initially grade