Tovec
Explorer
(self-quote)
I'm glad we reached the same conclusion about not changing the creature type with templates before it could be added on. The two examples I provided do not change the creature type from the ones required to use the template, and thus would be "free-abilities" (if overlooked by the DM). And I do understand how to calculate ECL. I decided not to bring up the HD of the creatures used so that I wouldn't have to effectively publish the template on here. Obviously, choosing the most powerful creature possible for your base creature would result in many racial HD being added to the build, and this would raise the ECL equivalently.
Woodling is fine - "Size and Type: A woodling’s type does not change, but it possesses fully developed plant traits (see below)."
Half-Celesials isn't fine - "Size and Type: The creature's type changes to outsider. Do not recalculate the creature's Hit Dice, base attack bonus, or saves. Size is unchanged. Half-celestials are normally native outsiders."
Taruic - "“Tauric” is a template that combines two creatures into one hybrid creature. The template can be added to any Small or Medium-size corporeal humanoid (referred to hereafter as the base humanoid) and any Medium-size or Large corporeal animal, beast, or vermin with at least four legs (referred to hereafter as the base creature). A tauric creature’s type changes to monstrous humanoid. It otherwise uses all the base creature’s attributes and special abilities except as noted below."
Yes, go out and pick the biggest baddest "Medium-size or Large corporeal animal, beast, or vermin with at least four legs". It is going to be a very strong Tauric creature but there is nothing I can find that makes it impossible.