New gel candlemakers get a friendly greeting to the craft with plenty of basic projects and helpful tips on technique; as they gain more experience, more detailed and exquisite items await their imaginative touch. Add glitter, insets, fragrance, and layers of color—even vertical ones. Among the awe-inspiring projects: a polymer clay spider “weaving” its web in stylish clear gel; a patriotic Stars & Stripes design; and even a Gumball Machine candle.