K LOVED this activity. She was so content the entire time. This is what we did:
I cut a large piece of clear Contact paper and taped it to the sliding glass door in our kitchen with the sticky side facing out.
We are currently focusing on the color orange, so I ripped up a bunch of little pieces of orange crepe paper streamers (tissue paper or even construction paper would work too) and gave them to her to stick on the Contact paper.
This was K's project, so I did not stick one single piece of crepe paper on the Contact paper. When I gave her the first piece, I told her she could stick it on the door and that is what she did. Then she kept coming back for more pieces. I ripped a bunch of pieces and put them on the floor next to her and let her do her thing. I also had some orange foam stickers, orange pom poms, and orange masking tape that I let her add to her collage.
This will stay up for a while and K can add to it or remove from it as often as she wants.