I could totally do this with money-- dollars on a pumpkin then popsicle sticks with bills and coins that add up to the amount. Addition/subtraction sorting - child needs to determine which sticks add up to the number on the bucket.
Talvinen maisema --- Another great idea for teaching value using shades and tints. The original poster of this project, art teacher Jessica Young, gives a great explanation of the steps and tips she used with her fourth-grade students.
Keyhole Paintings - Did with grade, turned out AMAZING. Draw then paint. Used oil pastels to create door and wood grain. Cut out key shape from template and wrote a sentence explaining their keyhole and attached to the bottom of the picture.