Meaning of manga backgrounds

Some manga panels have backgrounds with flowers or other things like cherries, checkerboard patterns, stars, etc. Where can I find the meanings of these things?
http://en.wikipedia.org/wiki/Manga_iconography

It's called being too lazy to draw actual backgrounds.

I'm not sure where exactly you will find your answer but I can tell you that each culture has grown through different experiences so I would start with cultural background research.