I express what I want to express through conversation and/or through writing. Other ways I express myself might be in how I dress, what I use to decorate my home or yard, what color or style of any object I use is, etc. Also, I express some things that I may not particularly want to express through my gestures, facial expressions, and eyes (I'm guessing).
Other things: I never express because I choose not to and am so skilled at not expressing them even my gestures, facial expressions, and eyes don't give them away. Sometimes, not expressing some things are the best ways a person can truly express himself. :)