Here are some pictures of a Virginia Bluebell flower growing in Memphis and Sellersburg Indiana. According to Wikipedia this flower is also known as the Virginia Cowslip, Lungwort Oysterleaf, and Roanoke Bells. The scientific name is Mertensia virginica.
The flower seems to start out looking like a deflated balloon or raisin that is violet colored. It then changes to a blue color and opens up into more of a bell shape.