Why does this have to be for a boy! Another Pinner: "Super fun idea for a little boy's room! My brother was super in Legos as a kid -- perhaps they should do this in Corin's room?
Una casita a medida con literas - Mi Casa
DIY Banquette Ikea Hack like this high back bench
Pallets-land: colorful terrace Yes.
Very cool indoor tree swing. I love the mural for a kid's playroom, that way they have a background when pretend! Bonus points for the trees!
vertical garden pallet wall / Revitalizacin Edificio Nios Hroes / Grupo Arsciniest Caution: Be sure that those pallets haven't held poisonous chemicals.