Arts are expressing ideas and exploring the mediums. 2's and 3's are still getting things together with hand eye coordination, and large and small muscle control. The open endedness of arts is more child friendly than the product orientedness of crafts. Paint on a lamp shade instead of paper. Laminate a picture between clear contact paper to make a place mat.
Colored paper is great.
Let children cut construction paper or magazines. Adults can cut neater, but children will gain mastery with scissors only by using them. Paste the cut shapes on the base. Sometimes children will paste each cut out on top of the previous one. I don't correct the child but talk about how I am pasting my pictures side by side or overlapping a little.