This is a very straightforward activity that children can manage alone that produces great results.
Circular object (or other shapes) to draw around
Use pencil to draw around your circles in a random pattern on the paper. Using a ruler, rule straight lines about 5mm apart across the length of the paper, missing out the circles as you go. Now join the lines over the circle, creating a curved shape from one side to the other. They should already look like they are ‘popping out’. Use coloured markers to create a striped pattern of your choice. Now you can add to the 3D effect by adding some light and shade using a white and grey chalk pastel if you wish. Just remember to decide which direction the light is coming from and keep it the same on all of your circles!