While canned frosting may be convenient to use it does not always pass the taste test. This is a page about making canned frosting taste more homemade.
If you need to frost something but don't have a pastry bag, you can use a ziplock bag as a quick and easy substitute. This is a page about use ziploc bag for frosting.
This makes a silky smooth pure white frosting. Simply replace the butter with white shortening in your favorite vanilla frosting recipe and add clear butter flavoring and clear vanilla.