The art of Swedish illustrator Ingela Arrhenius would be perfect for any mid-century modern travel-themed nursery.
And she's made some items that would be perfect in any room in the house.
Plus, some mid-century modern art that would look good anywhere, travel theme or no.
The only problem is Arrhenius' art isn't readily available in the States. You can find a few things, but most of her work will require you to pay in a foreign currency and wait patiently while it flies over an ocean to your house.