is this acceptable at work?

• is it okay to sit barefoot in my office? i don't want to walk around or anything, but i'd like to take off my shoes while i sit at my desk.
• is it socially acceptable to eat cupcake frosting from the container? we had cupcakes for june birthdays - we provided unfrosted cupcakes and containers of frosting so people could frost their own cupcakes. all of the cupcakes have been eaten, but there are a few containers of frosting left over... i'd like to eat the frosting.
• is it okay to wear open-toe stilletos with your nursing scrubs? does it fit within the dress code? or does it just look awful?