Eryk im Sexil, Mariola Brillowska, 1993

NSFW

Once Upon a Time (Byl sobie raz) Walerian Borowczyk and Jan Lenica, 1957

Undo, Marcin Wasko, 2003

The Ark, Grzegorz Jonkajtys & Marcin Kobylecki, 2008

Romans Dzentelmena, Tomasz Kozak, 2000

Also by Tomasz Kozak. Also NSFW.

Opera Ocalenia, Tomasz Kozak,1998

I'm gonna go ahead and say this one's NSFW.

Oczekiwanie ( Awaiting)Witold Giersz, 1962

Cyrk, Włodzimierz Haupe, 1954

Sciany (Walls) Piotr Dumala, 1988

Jak działa jamniczek , Julian Antonisz, 1971

No translation (I think the title is "how a Dachshund works")
but I really like this one anyway.

Hobby, Daniel Szczechura, 1968

Kon' (The Horse) Witold Giersz,1967

The Well: A Parable, Edward Sturlis, 1967

Hiver (Zima) Piotr Kamler, 1964

Trou (Dziura) Piotr Kamler, 1968

Invasion, Stefan Scabenbeck, 1970

Czarny kapturek (Little Black Riding Hood) Piotr Dumala, 1983

Kinda NSFW, if you are one of the dedicated souls who watches cartoons at work.

Metamorfozy,Lucja Mróz-Raynoch,1987

Martwy Cien (Dead Shadow) Andrzej Klimowski, 1980

Another mixture of live action and animation from Poland.

Zdarzenie (The Occurrence) Hieronim Neumann, 1988

A mixture of live action and animation effects that brings to mind the work of Zbig Rybczynski. And I LOVE IT.