So far, the following have been produced:

Pastel Pied
Albino Pied
Lavender Albino Pied ("Dreamsicle")
Spider Pied ("Spied")
Bumble Bee Pied
Lesser Pied
Black Pastel Pied

That's all that I can think of right now that've already been produced.

As for what to breed your pied to, I'd say pick your favorite co-dom/dom morph combo and breed the pied to both, and then breed the Morph het Pied offspring back together to produced a Triple Combo Pied... For example, breed a Pied to both a Pin and a Pastel. Then when they are large enough, breed a Pin Het Pied to a Pastel Het Pied and have 1/16 of a chance of producing a Lemon Blast Pied! (As well as 1/8 chance of producing a Pin Pied and 1/8 chance of producing a Pastel Pied)!