Attach the crepe paper to the back. I only had 4 colors because that was all that my dollar store had. It would look much better with some purple and orange thrown it, but oh well.
Very easy for preschool age kids! The only thing I did was cut the center out of the plate. Now you have a cute rainbow streamer to help bring in St. Patrick's day!
This is a fun activity that could be adapted for any holiday really. I got this idea from Enchanted Learning.