My DD has 4 boys & I made each of them a "cowboy" quilt out of western fabrics one year. Just find some "boy" material & make a regular pattern out of it. Animals, cars, sports - something like that.
I only have one DGD so have had to be creative in coming up with things to make for boys. You will find something really special I am sure. Let us see pictures when you have finished!
Polly