Here's a logo I did for a family that wanted matching shirts for their family vacation. They had seen something similar, but wanted a unique design. The only stipulation was using one color for cheaper screen-printing.
Here's a logo I did for my parents' organization that they ride horses with. There are many Back Country Horsemen chapters with separate logos to draw inspiration from, and mine comes from the Georgia chapter, where they used the outline of their state.
Besides that, it was specified to have 2 horse riders and a donkey, and only 1 color limited me to silhouettes.
Here's a T-shirt design I made for my brother's Crossfit team. He told me the name is a reference to the band Pantera. I took the idea of the snake from some of their album art and used a font similar to their style.