Although I call myself a scrap quilter, I guess I'm really more of a collection quilter and have found many ways to put together various themed fabrics that don't necessarily go well next to each other.
Having a son myself, I've usually leaned towards my donation projects being more masculine. Having said that, bold graphics can appeal to anyone! Not all boys are into sports. I've done bugs and dinosaurs and African savannas and jungles, space (and aliens!) are good.
I have no connection to them other than using them pretty much since they started, but I really like eQuilter -- especially their sales.
One of the fun things harder to find that make things more affordable but less choice, are their Scrap Packs. They usually do have a "boys" themed one but are apparently out. But looking at these representative groupings might give you some ideas. The scrap packs are typically the bolt ends and are under 1/2 yard each. Sometimes the end is quite ragged, it comes to them from the manufacturers like that.
https://www.equilter.com/category/38...se-scrap-packs
Their sales are good, but the mark-down clearance, and they often have limited flash sales -- which is when I indulge myself in fancy backs! I've always had good service, oh once or twice they were maybe a little slower than usual -- but they followed up with emails.