I've been experimenting with loose sketching styles. Bottom third was done with a blue pencil and fineliner (scanner ate the pencil), middle third is grey brush pen and ballpoint pen or fineliner (Brush pen and fineliner don't work well together and the ballpoint was of that unpredictable type that holds back its ink only to periodically diarrhea it on the paper), top third is brush pen/brown pencil with fineliner/a different ballpoint pen (scanner ate pencil again).
Also, I'm offering free art in the style of those doodles. Describe me a creature and get it drawn; the journal to dump the descriptions is here: http://www.furaffinity.net/journal/8429402/