The new Kassadin skin is heavily astronomy based?
Okay, so when I first looked at this picture, I failed to see how this skin had a connection to OCE. Kassadin's attire seemed to be rather not matching the culture of the region as I know it.
That was before I realized that the art contained stars, many stars. The stars appearing on his costume and in the background suggested to me that the skin is meant to be very celestial inspired. Certainly stars are not uncommon on the flags of the region (particularly the Southern Cross), but that's not really anything special. In that case, we have to look at the cultures of indigenous peoples.
I first looked at the Maori people of New Zealand, already knowing they have some folklore around the stars and have used them to navigatre the oceans way back in the past. I did some light digging and found this: http://www.astronomynz.org.nz/maori-astronomy/taatai-arorangi-maori-astronomy-2.html
For Australia, this: http://astrogeo.oxfordjournals.org/content/47/5/5.27.full Papua New Guinea has some mountains called the Star Mountains. That's all I was able to find quickly.
Most other countries in the region are small island nations, which probably at least used the stars for navigation. Astronomy is therefore likely an appropriate theme for Oceania, though I await further information on the skin.
