In the past I saw people suggest rp's based on songs and I found it a bit weird. Right now, I'm going to suggest an rp based on a song...well Rap battle actually.

One of the latest installments of the epic rap battle's of history stars Zeus and Thor as they verbally battle out who's the Superior god of thunder.
https://www.youtube.com/watch?v=i_xFOmYxKYw

This brought me on an idea. What if both divine pantheons reigned at the same time, the Greeks ruling the south and the Norse the North and were unaware of each others existence. When seeking to spread his dominion to the north Zeus surprisingly finds another Thunder got active in the area he visits. Mutual self glorification of themselves and distrust of the other quickly casues a fight to erupt between these gods.

My idea would be that we play out this epic duel between the two gods which would end in a draw and continue as a massive war between the two pantheons.

Deep knowledge of mythology isn't really required, the theme park versions of them all will do just fine.