These pretty and big sized Sticker are from Furniture Series ITOKI CREBIO. I don't know the exact purpose, maybe you could just stick them on your bought table? I'm still missing stickers from first season.
Manufacturer: Itoki Crebio
Size:

 

SuperS Series

Sailor Moon Itoki Crebio Sticker
1
Sailor Moon Itoki Crebio Sticker
2

Stars Series

Sailor Moon Itoki Crebio Sticker
1
Sailor Moon Itoki Crebio Sticker
2