Amy, I've tried to track down a site where these forms can be found for you, however I've come up empty. Apparently Ancestry stopped providing the state census forms some time ago and nobody has posted them elsewhere on the web. I did find one site with a variety of other state census blanks:

http://www.americanpomeroys.org/StateCensus.html

Unfortunately this collection was limited in scope and doesn't include NY. Hopefully some other researcher out there may know of another site that has what you're looking for - good luck and please let us know if you find any new resources.

UPDATE - mere seconds after I posted this I tried again and found a great link:

http://www.free-genealogy-forms.com/Special-State-Censuses/

It looks like both the 1915 and 1925 NY State Census blanks are provided there. Hope that helps!