My room is like an antique shop, full of junk, and weird stuff. There's a big sword in there. And a taxidermy bird, and a couple of birdcages. And a lot of newspaper cuttings. I used to have a weird thing about cutting out morbid headlines from newspapers, and collecting them. I was fascinated with drowning, which is kind of strange.
To be more childlike, you don't have to give up being an adult. The fully integrated person is capable of being both an adult and a child simultaneously. Recapture the childlike feelings of wide-eyed excitement, spontaneous appreciation, cutting loose, and being full of awe and wonder at this magnificent universe.