I've been drawing for as long as I can remember (since I was 2, according to my Mom) and I've maybe thrown 5% of it away. I have it all. My dresser drawers at home were (are?) filled with stacks of drawings and character designs, mostly done in school during all the boring stuff. Here are some from my work notebook, some done during meetings, some done during sketch class.
(from Marvel Comics' X-Men comics)
(from Marvel Comics' Runaways)
(from Marvel Comics' X-Factor)
JET character design
FORECAST & WOLF character designs