Dharmapala
An extensive collection of Nepalese Thangkas,including many White and Green Taras

Tibetan Buddhist Thangka
Including two Tibetan thangkas of the Green Tara. (Paintings)

Sacred Traditions page
Traditionally styled image of Green Tara by contemporary artist Bob Jacobson.

San Francisco Asian Museum
Four superb Green Tara sculptures from the late 17th century. From a series of 21 by the Mongolian sculptor/devotee Zanabazar Includes both beneficent and wrathful modes.

JLA
A modern pen drawing by JLA.

Tantric practice, and the Tara tradition, are common to both Buddhism and Hinduism. The Green Tara image in "Tantric Tara II" is from a late 18th c. Tibetan Buddhist sculpture.

If these traditions interest you, here are a few links that will help your exploration:

Tantrik Home Page
A very well organized site, devoted to traditional Hindu Tantra.

Buddhist Images
A comprehensive archive and database of Buddhist imagery on the Web.

Buddhist Resource File
Extensive Buddhist resource listing

Dharmanet
The gateway to Buddhist resources on the Web.

This is by no means a complete list, but will serve as a beginning. For additonal Buddhist sites, try the links for Electric Buddha (on this site).