You can download scores of them from the Play Store. Many have free versions, others are paid -- just double check that they're compatible with Nova, which most are. You install them separately, and after doing so you'll have the option change between packs under
Look & feel in Nova's settings:
View attachment 189876
Popular packs include Moonshine, Rondo, Cryten, Adastra and the like. Rotox is my standby. (
Screenshot)
I sometimes use Phonearena's
Best new icons pack for Android to track new releases, there are tons of decent packs featured in their ongoing series, with lots of pictures.
You can change the default home back to TW at any time at the bottom of the Nova settings menu (
Select default home).