Some ideas for beach themed cabinet knobs include starfish- or shell-shaped knobs or blue- or green-toned glass knobs. Another idea is to use nautical-themed knobs, such as rope pulls.
There are many beach-themed cabinet knobs available at home decor stores, as well as websites such as HardwareForLess.com and Build.com. These include knobs in the shape of shells, starfish, turtles, seahorses and other fish. These knobs are sometimes mixed and matched or used individually. While some are made from nickel or brass, others are made from wood or ceramic and painted to look like real shells or starfish.
Glass knobs are another option for beach-themed knobs. Especially in blue or green tones, these knobs mimic the look of sea glass. Bubble glass knobs, which look like water, are another idea. Several examples of glass knobs are available at Anthropologie.com. Similarly, painting wooden knobs in blue, green or gray shades is another option for evoking the feel of the beach.
Nautical themes can vary from subtle to more dramatic. Subtle nautical details include drawer pulls or knot knobs made from rope, which are both rustic and functional. Ship wheel knobs are an example of a more overt nautical theme and are available at Kitchen-Cabinet-Hardware.com, as of 2015.