Best combination of great work of arts in empty slots???

Umm.. nothing? What do you mean in empty slots? If they are empty then there is no works, so you can't get a themeing bonus.

with the exception of Museums, all wonders/national wonders that have more than 1 slot for art work have some sort of themeing bonuses.

By default, all works provide +2 tourism and +2 culture (or +1 I don't know).

The Lourve has the highest possible themeing bonus with +4, and up to +8 with the Aestethic Finisher, and if you are France that jumps to +16 in their Capital.
 
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