Tulip Cookies

I'm learning to make iced sugar cookies.  I found several good recipes on All Recipes.com. I used piping bags and a number 3 tip to pipe and a bowl with the thinned icing, but next time, I think I will get squeeze bottles.  The icing definitely has to stay covered and I think using a squeeze bottle instead of a bowl for the thin icing will give me more control when filling the colors.  Here are some tulip cookies.