I thought I would post this with school starting soon, and as Pagans, we usually have trouble with bullys. This is a very simple visualization you can do if you feel like you could come in contact with any type of bully.
1. Ground and Center
2. Visualize a strong ball of white, Protective energy around you.
3. Tell the sheild with your thoughts that its purpose is to keep anyone seeking to do harm away from you.
4. Throughout the day, ask the Goddess and God to empower your sheild so that it remains strong throughout the day.
I know this seems to simple to work, but with strong intent you will keep any Bully away from you. But make sure that it is only for Bullys, as you can end up keeping a lot of people away from you.