For our second son's nursery we were using a former guest room that gets a lot of light, so we wanted to keep the palette neutral, airy, and mature. We didn't want to be tied down by a set theme, but decided that rustic, barn-inspired accents would make it feel a little more masculine.
Both of our boys have fairly mature, neutral rooms because we didn't want any place in our house to scream "Baby!" and we wanted them to transition well to older boy rooms. I used Pinterest to find neutral themes, but largely went with elements we use in the rest of our home; rustic wood mixed with metal and more modern pieces, clean-line furniture, simple art work, eclectic pairings.
Clean, simple, modern with rustic touches, neutral, light and bright.
Metal Letters ("WEBB") - Hobby Lobby
Wooden Houses - Hobby Lobby
Lolly & Me Mod 4-in-1 Fixed-Side Convertible Crib, Pebble Gray - Walmart
Glider - Walmart (from older son's nursery)
10 Spring Street Preston Woven Ottoman, Tan - Walmart
Quilt and Lovey (hanging on crib) - The Modern Robin
Valance - Modernality
Burlap Pennant Flags - Hobby Lobby (party section)
Cream Blanket - Marshall's
Hexagonal Shelf - Hobby Lobby
Ceramic Milk Jugs - Target (Craft Section)
Cream Poufs/Balls - Michael's (Party Section)
Industrial Cage Ceiling Light in Bronze - Shades of Light
Reclaimed Wood Ladder - Amazon
Plaid Blanket - Target
Light Teal Side Table - HomeGoods
Fake plants and metal pots - IKEA
Wooden Bowl (on side table) - Target (kitchen section)
Graco Sound Machine - Amazon
White Curtains and Nickel Rod - Target (old)
Metal toy bin - Hobby Lobby
Barnwood Frame with Twine - Hobby Lobby
Corrugated Metal Sheep - Local Seller
White Hemnes Dresser - IKEA
Dresser Knobs - Hobby Lobby
2-Tier container - Target (Garden Section)
Crib Sheets and Changing Pad Cover - Target
Wood Art - Hobby Lobby
Hexagonal, Triangular and Cow Prints - Best Designland
Watercolor "W" Print - Little Emma's Flowers
Wooden Art with Saying - DIY
I love the Wooden Art from Hobby Lobby as well as the lettered wood art my mother made for the room. While it won't always stay in the nursery, the quilt from The Modern Robin is beautiful and will look great for a long time to come.
Don't limit yourself to shopping in the baby section of stores and stick with mostly neutral colors (browns and grays can match!). Pick one or two accent colors to keep your eye out for.