I've been using this idea for a while now, especially on furniture. I entered this into Illustration Friday, which is a cool group on Flickr. Each week there's a new topic posted and you have a week to upload an illustration to the group. There's also a website.
You can't see clearly, but the whale is just under the aircon, as well on my table. I did some drawings just on plastic as a way to decorate without hurting the walls, but it was also my inspiration while I worked.
