A little more info is required. Are needing 2D or 3D resources? (yes, I know this is the 3D chat thread, but posts do get mis-filed.) Is the shape under the robot a sphere or a diamond?
If 3D objects are needed, it is quite possible you will want to animate the eyes. Should I include a separate 3D model for the eyes so you can place different textures there? [ie Look left, look right, Xs for eyes, etc.] Should the diamond/sphere under the robot be a separate model so you can swap shapes and colors around?
Where would you like the origin (the 0,0,0 point) of the models to be? If they are always travelling on a flat floor, putting 0,0,0 at the feet might be good. If they need to pivot on all three axis, then placing the 0,0,0 point near the center of mass would be better.
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TAZ
I also believe in helping folks to help themselves. Have you ever tried DoGA? It would be fairly easy to make these critters in DoGA.
http://www.doga.co.jp/english
Quote: "Oh and please make em animated so they hover moving up and down."
Is that really needed? You can use the SIN function to easily create a hover bobble effect. And, by doing that via code you have more control over the action. Image if the critters got knocked over or were climbing a slope. A canned animation would not be as good as a programmatic solution.