Step 7. Use the ellipse tool to drag out an oval about 50 pt wide by 100 pt high. Use the direct selection tool (A) to reshape the oval into a bulb shape. If you want other colors of bulbs, duplicate the shaped oval and change the fill colors so you have a variety.
Use the gradient mesh tool to shade your bulbs. If you aren't familiar with using the gradient mesh tool, read my tutorial, Using the Gradient Mesh tool.