Penny Black has absolutely beautiful floral stamps that make for really elegant cards. We have many of their brand new stamps and dies, so you will definitely want to give them a look.
One of the popular line of stamps from Penny Black is their Brushstroke floral images. If you have ever been intimidated by them, definitely give this video a look. It gives you ideas for using the MISTI and watercoloring the flowers:
Here are more ideas for using their stamps. They pair well with sentiments for any occasion: