More animals would be nice, and maybe there could be a mini-game where you feed your animals with your crops!
Hyacinth, Lilacs, myrtle, Jacob's ladder, impatiens, snap dragons, petunias, blackeyed susans, tiger lilies, these are all things I grow in my flower bed....which I think would be a cute decoration...I have an old (1920's?) Steel hospital bed frame buried in my yard with flowers growing in and around it.
How about water tiles!!!!!!!!!!! Rocks or boulders
Water tiles, both straight edged and curved.
Houses in which you can choose the color (in the same way as choosing fence colors).
A water star level connected to each farm's banner - similar to the current experience level connected to each farm's banner.
Baby animals
I just thought of this:
Water Tiles!
I think many people would enjoy those.