Most days I manage to find 15-30 minutes (sometimes not all at once) to sketch, scribble, or steal something for no particular reason.
Follow the randomness at There Is No Dog, my online sketchbook.
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If you are new:
This blog where I post new work - usually one or two posts per month.
My sketchbook is where you'll find something new every day.
My web site is an archive of published work - illustration, music, comics. For the most part it is older, out-of-print material (I am not always free to post new work and in deference to publishers or labels trying to sell a book or album, I usually hold off making new stuff available for free for some period of time... but everything ends up there... eventually).