Wisconsin souvenirs for kids

We're packing up the fam to go visit our relatives in OK and I want to bring some souvenirs/presents of some sort for the cousins, who range in age from 1 month to almost 5 years (sizes newborn to 4T). Any ideas for what to bring 'em?

I like to give gifts with a local flavor if possible (for adults i like things like wisconsin-made mustards, cheeses, or various yummy items made from door county cherries), but that doesn't have to necessarily be the case. My current best idea is matching Wisconsin t-shirts (tho I am having a hard time finding matching shirts in this range of sizes). If I had more time I would check out that vendor who sells the peace sign applique t-shirts at farmer's market in madison saturdays, cuz I think those are so darn cute, but we're leaving b4 then.

Any other ideas?

I realize this question is somewhat ironic given my siggy! :LOL