Here's a line with "shirting" type fabrics that screams male:
http://www.fatquartershop.com/woven-...quarter-bundle
I'm making a quilt for my brother with blue and brown batiks using this line:
http://www.fatquartershop.com/rockpo...quarter-bundle
Or you could try something with solids:
http://www.fatquartershop.com/neutra...quarter-bundle