Refurbishing mirrors with plastic eggs
I think this is the project you are looking for: https://www.hometalk.com/14568670/easter-egg-mirror
You could also turn the eggs upside down and get more of a flower look.
Sherry: here's another:
hey Sherry, This might be the tutorial you were after
check this out: http://www.creativelylivingblog.com/2016/01/diy-bubble-mirror.html
Stick them on with suitable glue or epoxy. Take the time to work out a design and then go right head. Have fun....