Package name is openoffice.org-style-crystal. Other styles have the name openoffice.org-style-****. It may not be this; package description only mentions icon sets. But I can report that it's all I changed from the default install, and my Oo's not fugly. Also, you may want the Oo quickstarter (oooqs2-kde). On my old lappy (1G RAM), it causes no noticeable boot-lag, but nicely boosts the launch.
"The greatest enemy of a good plan is the dream of a perfect plan."
--Carl von Clausewitz