I have made one thing so far, of which I'm proud:
(He's an Ewok)
I found him on the inspiring blog of Lucy Ravenscar who has successfully managed to combine her interests with those of her sons' and my son's too, which is no mean feat, take it from me. You can buy the pattern for the Ewok and other Star Wars characters from Lucy's Etsy shop.
Following the themes of crochet and the interest of small boys, I am in the middle of making an Adipose which I found on a great site called By Midknight via a very useful site called Free Amigurumi Patterns that does what it says on the tin.