(1) Vicenza woven-leather button knobs in black and cognac, $22.50 each, at Katonah Architectural Hardware, 149-13 Merchandise Mart, 312-670-1313. (2) Traditional faceted green glass knob with oil-rubbed bronze base, $10, at Restoration Hardware, restorationhardware.com. (3) Michael Aram oil-rubbed pebble knob (large), $10.97, at Lowe’s, 2630 N. Narragansett Ave., 773-413-5120. (4) Sietto’s handcrafted glass Stratum knob in woodland and powder blue, $17.25, at Clark & Barlow, 353 W. Grand Ave., 312-726-3010, and sietto.com. (5) Bronzes de France gold-plated Flower knob, price upon request, at Katonah Architectural Hardware. (6) Sietto’s Cirrus knob in white with brown accent, $17.25 each, at Clark & Barlow. (7) Nanz Custom Hardware’s cylindrical cabinet knob in dark oxidized bronze, price upon request, at the Nanz Company, 103 Merchandise Mart, 312-527-1300. (8) Vintage cast bronze knob, $5, at Architectural Artifacts, 4325 N. Ravenswood Ave., 773-348-0622. (9) Nanz cube cabinet pull in polished nickel, price upon request, at the Nanz Company. (10) Crafter’s glazed ceramic knob in peach, $6, and (11) Anthropologie confetti glass knob, $10, at anthropologie.com.

Photograph: Howard Bjornson