In 4th grade, are building on their vocabulary and can use more artistic techniques and tools. Lessons can encourage expression of ideas, emotions, and finding freedom through creativity. All of these are just suggestions.
Activity: watercolor paints, salt
There are many tutorials for this kind of activity. Here is another similar lesson
Activity: drawing, rulers, paper
There are many tutorials for learning how to draw in one point perspective. Here is another example.
Activity: drawing, sharpies, markers
Talk about artist Yayoi Kusama. See instructions here.
Activity: paper, scissors, markers.
Talk about artist Jean Dubuffet and make paper sculptures out of abstract shapes. Lesson results shown here.
Activity: sketching, oil pastels, watercolor
Based on Art in Action Program 4 Lesson 1. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: sketching, oil pastels, tempera paints
Based on Art in Action Program 4 Lesson 4. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: sketching, oil pastels,
Based on Art in Action Program 4 Lesson 5. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: paper collage
Based on Art in Action Program 4 Lesson 6. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: sketch, chalk pastels
Based on Art in Action Program 4 Lesson 7. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: sketch, oil pastels, watercolors
Based on Art in Action Program 4 Lesson 10. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: paper collage
Based on Art in Action Program 4 Lesson 6. See lesson plan, supply list and instructions in the Art in Action binders in Exploratorium
Activity: focus on vocabulary of foreground, middle ground, and background.
You could do many different variations on this lesson but the overall idea is shown here.