Looking for a cool counter-culture souvenir from Europe

Hey travel community! I’m currently planning a backpacking trip across Europe for later this year, and instead of buying the usual tourist trash like cheap magnets, keychains, or plastic shot glasses, I want to collect some genuinely unique, counter-culture souvenirs from different countries. I want items that are small, easy to pack in a backpack, highly authentic, and representative of the local alternative scene. I’ll be spending a good chunk of time in Central Europe, including Poland and Germany. Any cool ideas for unique items to look out for?