UPDATE (12/2/13) - Added a couple of larger bases (big, oni) from some modified ones I was using for Yuugi and an OC. Also added in the approximate heights, for scaling (which were previously on another sheet). For those too lazy to calculate: Eta is 5'1, Tiny base is 4'7, Big base is 6'5, and Oni base is 7'3 -- 1 px = 2 in.
Body bases for Eta (ETG). Feel free to use, but please credit and link back to me.
(And I'd also like to see what you've done with it.)
ADDITIONAL RESOURCES:
A free-to-use sprite sheet with dynamic poses and a walk animation of the Normal Etabase by Son-Isaki. Please give credit to him if used.
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Check out some of my friends' sprites using these bases:
Yoshi | Char | Serenes Forest community topic | 
Nice bases.