Dogs Made out of Flowers

If you type “flower art” into a search engine, these are the pictures you get (if you don’t count pictures and cards made with dried flowers pasted on paper, which I don’t).

I think they’re pretty cute (the white ones bear a certain resemblance to my daughter's chihuahua) but I haven’t been able to find out where these came from or how to create them (are those pompom mums or dahlias?). Somehow I suspect they’re from Japan. If you have a clue, let me know.