I usually just use a number 2 pencil and copy paper for my webcomic. But since I scan my deviant pics to color them I normally will use anything. In the past I've used the inside of frozen waffle boxes, the flat cardboard card in peanutbutter cups packs, basically anything flat and paper like I'll use.
Coming from a sculpture background, the materials almost always determine exactly what you are going to make, but it never stops you from making something. I do agree the right tools for the right job is a good rule to follow, but improvisation and adaptation are always great challenges to any artists growth.
the better your tools, mixed with your skills will equal in a better outcome. I mean I'm a tattoo artist on the side, and my answer should be "I will draw with pretty much anything on pretty much anything" cause I have to draw on skin from time to time... but the right tool for the right job always helps.