One of Tammy Kohl's toughest tasks is coming up with clever ways to inspire more people to visit Taköhl, a Gallery of Exceptional Jewels, a 24-year-old Chicago purveyor of designer jewelry (by Stephen Webster, among others), photography, and paintings, as well as Kohl's own sterling and 18k gold line.Kohl strives to present patrons with "creativity and freshness," she says. She hosts art shows spotlighting jewelry and other artistic creations up to five times a year. From late June through August, she held one of her more inspired exhibitions, Sustainium, a display of eco-based artwork featuring preserved moss montages, plant and aquatic installations, suspended container gardens, and prints and drawings from artist Ashley Lieber. It was the perfect platform for Kohl's recycled silver pieces, capped by green gems such as peridot. Agate and fluorite necklace with sterling silver;