For use with beer pong, I used the castle on each end of the the table. The castle has steps that fit nicely with the 10 cup game (note I added Bowser and his 7 Koopa Kids to the castles as well as a few toads, Peach and some fire balls).
For use with flip cup, I have friends who love certain worlds of SMB3 so they have "shotty" a world. There are the 8 worlds and thus 8 sections for flip cup. My favourite is the desert land one due to that sun!
Both beer pong and flip cup can be played at the same time too!
Just add friends, cups and beer!