We've rounded up 27 striking keycaps, sets and individuals. All are designed to fit most Cherry MX-equipped mechanical keyboards, except where noted. Some may work with other types of switches, too; check the vendors' detail pages to confirm. Prices were current as of publication.
First: You'll feel the power with this aluminum-and-titanium sculpture. Get it at GeekKeys for $32; a small metal storage box is included.
You don't mess around -- and neither does your keyboard. This handmade keycap is available via Etsy for $13. Copper ($18) and sterling-silver ($60) varieties also available.
BGkeycaps via Etsy
This piece of fun is produced by a 3D printer. The nylon-plastic brick, available in a variety of colors, can be had for $5.70 at Shapeways. (Or, only $4.70 for one in white matte-finish.) Splurge, and get one in platinum for $3,000.01.
This seven-piece set is understated, but, owing to its high-density, metal-alloy design, substantial. The keycaps are only compatible with Razer BlackWidow mechanical keyboards. (Razer uses proprietary switches.) Get it for $29.99 from Razer; keycap-puller included.
Get a feel, literally, for your keyboard. Order and customize the keycaps individually, for $3 each. WASD Keyboards allows you to specify keycap size and color, and choose from one of four design textures: crosshatch; horizontal lines; dot matrix; and, radial.
No logo, no design, no joke. It's just solid and silver -- and eye-catching. Get one for $55 at Etsy.