Throwing rice over a newly married pair is read as showering blessings and wishes for plenty. Tradition takes it as joyful send-off and the hope that a new life will grow and flourish.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.