It's been an age since I have done anything half decent in illustrator - I used to do vector work all the time but found working digital not conducive to pushing my drawing/painting skills. But on the way to and from work I kept thinking about 'Bubble Heads' - not sure why, but below is the pencil scamp that I put down when I got my pad out.
A quick search on the internet for a little guidance on creating convincing vector bubbles and the above is the result :-D No photoshop at all (well apart from cropping down the screenshot). Happy how he turned out.
For a larger version of him click here.