My favorite beanie is the Fake Isle hat (on KPC), and it can look manly depending on the yarn you use. I also recently made a plain beanie similar to the Fake Isle hat, but without the color work. I was going to make it with the fair isle, but the black CC didn't really show up against parts of my striping MC. I think any plain beanie can look like a good masculine cap if you choose the right colors.
Here's a pic of my "manly" Kureyon hat, which only takes one skein: