I think what makes a great boy room is the wall color and design. You don't need to be a professional painter to pull off these looks.
I've got to convince one of my 3 boys to have a super hero room! That wall is painted using geometric shapes and about 4 colors.
Take a look at that wall paint! I never would have thought to do a mural in more like a "shadow". This would be so doable, especially if you got the dinosaurs in vinyl first, and then match the paint color to the vinyl color.
This is a little busy for my taste, but I really like the initials and pictures above the bed. I also love the stripes - very cool that they switched the colors at the windo to give each child their own identity.
My friend painted camouflage in her son's room and it turned out amazing. My friend did the camouflage on the bottom 1/2 of the wall, but I really like it on this closet wall as well. The black stripe is chalk board paint
This is my oldest son's room, a rocket room. He wants to be an astronaut and is obsessed with space. I traced the rockets and planets from the quilt and made paper templates. I painted the ceiling navy blue and then used a stencil for the stars and planets.
My other 2 boys share a room, for now. Dylan choose a sports room but I wanted it to be elegant like a nursery. So this was our compromise, white bead board w/ a red chair rail and blue on top. I turned that round light from IKEA into a baseball using navy yarn and a red sharpie.
I really like this photo collage! I can totally imagine this done with my boys artwork and/or sports pictures. FYI: You can get the vinyl lettering on Executive Homemaker.
I've got to go to take some medicine and get in bed. Hopefully you've been inspired by these amazing boy rooms.