PLACE CARD/TABLE NO. UNIQUE IDEAS?

Any place card ideas? i have 400 guests so i cant do trees..anything unique

also i dont want to ruin my table decor so i dont want any menu's around the table..my only current option is round menu's on each plate..any other unique different suggestions..

I HATE BEING TYPICAL

Maybe put the menus on fans so that they close up small and guests could also use it to fan themselves? 1/couple would suffice.

As for the place cards, it might be hard to make the card themselves unique with so many guests, but maybe the tablescape could be unique, like standing them on a huge blanket of grass