Poke at me on NG if there's something you'd like drawn, rates are variable since people want things of very different complexity usually.
A good rule of thumb for the big stuff is: Full piece with BG. 40-60$ (Lineart). Full piece with BG 60+$ (Rendered).
But again, I'm a reasonable lad so hit me up with whatever strange thing you've had on the subconscious backburner.