Actually not a bad idea for centerpieces. Moss table-runner with loose succulents, mini terrariums and mica flakes.
Rainbow roses ARE real roses! A rainbow rose is made by inserting dye into the stem of the rose while it's growing. The color gets absorbed by the petals of the flower. They're hard to find.
Hanging Flower Balls---styrofoam ball, hot glue, and a bouquet of fake flowers