The Mahasiddhas:
The root gurus
of Tantric Buddhist Yoga
Each Mahasiddha is known for his or her writings and songs. A song of Nirgunapa (shown above) and Kukkuripa are here.
Mahasiddha Nirgunapa
Our true guru's precepts show the peaceful center,
Pacifying violent emotions and conflicting thoughts.
Stifling those wave-like disturbances in meditation
We conduct ourselves with attention and poise.
Mahasiddha Kukkuripa
Where conscious effort and striving are present
The Buddha is absent,
Thus, ritual and offerings are futile.
Within the peak experience of the guru's grace
The Buddha is present,
But will the fortunate recipient see it?
Mahasiddha Santipa
His song to his student Kotalipa is profound.
 
above two excerpts from Buddhist Masters of Enchantment, translated by Keith Dowman.
Who are they?

The Handbook for Enlightenment

It is only the Mahasiddha who is a pure living mandala, embodying the realization by his existence in all of the worlds that samsara is nirvana.

It is apparent that the eighty-four mahasiddhas all had one thing in common: They practiced the advanced third cycle teachings of Lord Buddha, in which extremely unfortunate circumstances that an individual finds himself in and that would normally make enlightenment impossible are completely reversed into a state of total enlightenment.
excerpt from Snowboarding to Nirvana by Frederick Lenz
Online artwork featuring the eighty-four Mahasiddhas
An extraordinary book by Keith Dowman that tells the stories of the eight-four Mahasiddhas. Throughout are stunning paintings of the Mahasiddhas, done by Robert Beer. Available for purchase at iMeditate.com
Tibetan Art Shop
Beautiful collection of Buddhist paintings and statues from Tibet and Nepal.
Ghantapa Flying Over the Land
Ghantapa got hassled by the local King, and so decided on a little sweep-and-clear action. As fate would have it, Avalokitishvara dropped by and smoothed over the situation.
Tibetan Art
Dedicated to collecting electronic versions of Tibetan art, and making them available via the World Wide Web.
Astamangala
From Holland, a fine collection of Tibetan and Buddhist paintings.