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Nature theme nursery
One wall with tree (gray) wallpaper and 3 walls in a color (thinking a lighter blue with darker pinstripe or accent). Faux tree stump stool/table in natural wood or white.Reclaimed wood book shelves hanging on wall as well as some paper machet or faux animal heads of some sort. RH has some that are expensive, but there are some more plastic ones shown below. I could pretty much go with any fabric to match wall color and a natural wood or charcoal dresser/changer table.
darker charcoal tree wallpaper
bookshelves hanging on wall
like paint, but with a darker color mixed in.