If your ears aren't pierced, go with the clip back earring component.

Ear wires with a bit of decoration.

A self-closing ear wire.

A rounded ear wire with a long tail that hangs behind the ear.

The "regular" type of ear wire found on earrings - some have a ball and coiled wire around them, like the one shown; some are plain.

Sterling ear wires are similar to these in shape.

Smaller version of the Large Round Ear Wire, but without the long tail.