I think that horses would be a good idea, you could find them in the plains and to tame one you could use wheat. If you attack one they all run away really fast giving you no chance of catching them until they stop running. about half a block taller than steve. The tame ones should look like Epona (Link's horse)
And the ones that arent tame should look the same but without the saddle, also different colours would be cool. Just as a suggestion.
