Life / Romanian graphic designer needs help about Poland's culture and symbols [4]

Hello.
I am a graphic designer from Bucharest, Romania and I have just discovered your forums.
I need some help regarding a logo design to express The Polish-Romanian Friendship for the "Instytut Polski Bukareszt".

My questions are: What symbol, image or sign would you consider to be most suitable to represent Poland? Should it be modern or traditional? What is the most representative pattern/sign/drawing for your traditional folklore? But the best image/symbol for your modern/contemporary culture? Can you link me to an example or inspiration source for my issue?

The best example so far is the facade of Polish Pavillion for the Shanghai 2010 exibition. Your architects used a traditional pattern on a very contemporary shape. My interpretation is that your country wanted to show it's unique identity in a globalised world, but keeping up with the latest trends and technologies as well. It was a very apeciatted statement, translated in a clean architectural and symbolic language.

So, I hope you can help me know your country better!

Best regards from Romania!
Thank you.