If you are running 10.5 or older versions of OS X, there were several different theming apps, some worked better than others.
Apple has made that kind of option quite challenging now, but there are still some possibilities.
Flavours allows you to use and create themes for OS X.
https://www.macupdate.com/app/mac/47496/flavours
And, Apple might provide something like what you found, if you upgrade to OS X 10.9 (Mavericks) when it is released.
As many notice (for better or worse), OS X and iOS are merging to some extent. Apple might offer an appearance option in OS X to more closely resemble iOS, if that is your preference (not mine
)