Below is an art print I just found on Etsy...perfect for a gender neutral room. Something about a mommy or daddy elephant with their baby is way too cute, and I like the color palette going on here. It's not too cutesy but still bright and happy.
Etsy seller Malathip
TIP: If you're just getting started on planning a nursery and not sure where to start, take your favorite item that you've already purchased - a blanket, an outfit, a piece of art, a toy - and use that as inspiration for the color palette for the room.