My co-worker tells me that I am more creative at planning art activies than she is. She often uses my ideas for her class. I normally don't mind sharing, some activities, but I work hard to plan and since I like to recycle, I spend time collecting needed items or ask parents to donate. Recently I sent out a class newsletter with info and upcoming dates. At the bottom I asked parents to save Pringles can lids for a fall project. I noticed later that my co-worker had copied my newsletter and put in her students cubbies as well. She doesn't even know what I plan to do with the Pringles lids. I am ticked! Am I being petty?