I’m a fan of retro gaming, but not quite enough to completely permeate my life with it (close, though). If you’re different, however, this collection of most of the Space Invaders junk that’s available on the web should suit your purposes.
I’d probably go with the glasses and cutting board, but beyond that it’s all just a little too… blatant, isn’t it? I like my nerdery to be one level below the surface. It’s not that I’m ashamed, I just wouldn’t want to be pigeonholed because I was wearing a Space Invaders beanie and belt.