I think…two things:

1) I think we should move away from 2020something name of themes. Have a poll or something like that. People submit name suggestions then vote for their favourite. Obviously filter out bad suggestions (racist, hateful, suggestions that are too closed to trademarks/copyrights, stupid ones – like blablabla sucks theme). The person that suggested the winning name gets an all expenses paid trip to WordCamp US/Europe/Asia or to one in their country (expenses paid, like if someone in Let’s say Lisbon wins, but WordCamp Europe is being held in Warsaw Poland then all expenses to get there plug WCEU ticket, but if the winner is in Warsaw Poland then just the WCEU ticket.)

2) Maybe some theme authors could submit their themes to be the next default theme. With voting (just like above).

Price for either above could be, instead of trip to nearest WordCamp…free hosting for a year.