What kind of shirts to wear for a skinny guy?

I'm 5'10 to 5'11ish, and around 130 pounds. I only have 5 shirts that I wear, they are t-shirts, the same exact brand and model just different colors. They are slim-fit and small size and fit me perfectly. But a friend recently commented that I always wear the same thing, but she meant shirts. I don't like shirts with the brand name on them in big letters or anything that makes me feel like a tool/walking billboard, and I don't like to wear flannel shirts because I'm skinny so I don't feel that they look good on me. Can you guys maybe link me to any shirts made with skinny guys with my build in mind? Long-sleeved are fine, pretty much anything is fine if it will look good on my build, and you think it would be a good looking shirt to see a guy in. I'm a swimmer, so my arms are really toned, so short-sleeved t-shirts would be preferred, except I'm not sure you would be able to find any with a good looking design. I don't really want plain colored ones, as I have 5 of those and they're all I wear. Thanks in advance! :)