Here are a few groups who do missions work in poland.  Maybe they can help with other ideas.

http://www.polandem.org/about-us/

http://pcmusa.org/ministries.htm#Anchor-Childre-11450

http://blog.fhbc.org/missions/poland_missions/

http://www.worldmissionspoland.blogspot.com/

I'm not familiar with any of these groups....just googled Mission trip to Poland.  Boy, do I wish I could come!

Julie