We took a guest room and converted it to a nursery for our upcoming baby girl.
We saw a similar colored wall in another nursery and liked the neutrality of it (we can take out the pink flowers and make it a boys room rather quickly if we have a boy in the future).
Modern, clean, fresh.
We painted the walls with Behr paint and purchased the wall art from cherrywalls. The dresser was from Amazon, the changing table and crib from babies r us, and the chair was made by my brother about 10 years ago. The rug was from wal-mart or target (can't recall as we bought three rugs at first).
The tree wall art was not easy but not too hard... its really nice in person.
Buy items on sale and just go with a theme (let the individual items fall in to place).