Kinuskikissan tervehdys - Tutorial on many piping techniques. It is in Finnish, use Google Translator. Lots of tips, uses a ziplock bag for the huge Wilton icing tip, grass tip to decorate the side of a cake.
Learn how to make a piping bag out of parchment paper. Parchment paper pastry bags are perfect for cake decorating, especially piping small details, fine lines, writing without a tip, stringwork and for whenever small amounts of royal icing, buttercream or melted candy are needed.