Little boy’s room painting ideas?

Little boy’s room painting ideas?

Can anyone point in me in the right direction for some fun designs for painting a little boy's room? Moo is 3, going on 4, kinehura and we hope that he'll share this room one day with his sibling, who is due any day and we think is a boy. I don't suppose we'll make the final decision on the room design until the baby get's here, G-dwilling, but I'm nesting and want to start looking. I'd like the main color to be sky blue with some kind of green accenting. I just don't know how to arrange it all or what exact colors I want, etc, etc. So I need some ideas for the details. Help! Edit: I guess I should have been more clear, sorry. I'm not looking for any kind of characterization or theme, since his interests change so often. What I need are good ideas for how to arrange colors.
I certainly was happy while playing in dirt this weekend :-)

I certainly was happy while playing in dirt this weekend :-)

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