Hi, I'm a technology enthusiast and Internet knowledge sharing advocate who might at any time decide I should correct or enhance a Wikipedia page, though I haven't to date done that. Hence my presence on Wikipedia as a user.
To list all user templates, so you can find something appropriate to add to your user page like I have, try this Wikipedia search or look at the more organised list at the Wikipedia:Userboxes page.
Note to visitors: if you know how to convert that first link (to the template namespace search) to an internal Wikipedia link, please do so.
Don't forget to log in before editing, like I did today :-) If you forget, your edit will be attributed to your current IP address (mine is listed against the edit immediately prior to this edit).