First of all: Thank you for all the fav's and comments! I'm totally enamored with the human body and have been drawing it since I was a baby, so I tend to look towards my own body and others for material. I tend to gravitate towards very expressive elements of the human form (in particular, faces, hands, and feet).
The materials I use also influence me - I generally grab whatever I have on hand at home - saran wrap, aluminum foil, what have you - and just start playing with them by burning, melting, ripping, sewing. When I find something that excites me I go with it!