On white cabinets, you can't go wrong with silver or glass, and painted ceramic knobs really pop.
Glass 1" knob in polished nickel, $13, restorationhardware.com
Floral burst 1 ½" stoneware knob in forget-me-not blue, $8, anthropologie.com
Cherry 1 9/16" knob, $9, whitechapel-ltd.com
Red basic floral 1 ¼" ceramic knob, $4 for a set of 2, worldmarket.com
Multicolored floral 1 ½" ceramic knob, $8 for a set of 2, worldmarket.com
Thread and metal wire weaved 1 ½" knob, $8, knobco.com
Simple stripe 1 3/10" resin knob in pool, $10, pbteen.com
Swirl 1 ½" silver-plated bronze knob, $5.50, michaelaram.com
Pressed flower 1 ¾" glass knob in orange, $6, urbanoutfitters.com
Sea stone 1" knob in neutral, $14, uncommongoods.com
Couture 3" brass pull in satin nickel finish, $25, baldwinhardware.com for stores
Give medium-wood cabinets…