
For his Mikenesses series, Adventure Time and Bravest Warriors cartoonist Mike Holmes drew himself (often accompanied by his cat Ella) in the styles of more than 100 different cartoonists and animators. It's a neat study that shows a real understanding of the styles—and it's also incredibly charming.
It looks like Mikenesses have been on pause for a while, but Holmes has tons of them up on his Tumblr. Here are just a few of them:
In the style of Quentin Blake:

In the style of Berkeley Breathed

In the style of Wallace and Gromit

In the style of George Herriman

In the style of Dr. Seuss Chuck Jones

In the style of The Powerpuff Girls

In the style of Graham Annable

In the style of Archer

In the style of Osamu Tezuka

In the style of Gary Larson

In the style of Rob Liefeld

In the style of Nicholas Gurewitch

In the style of Bill Watterson

Mikenesses [Mike Holmes Draws via MetaFilter]
DISCUSSION
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That's not the style of Dr. Seuss, that's the style of Chuck Jones.
That said, these are amazing! Even captures the voice of each artist (George Herriman in particular).
The only one that doesn't seem completely true to form is Rob Liefeld's... if only for the inclusion of somewhat relatively-shaped feet and reasonably-sized shoulder pads.