I use the Wilton method for cake decorating. I use mostly all their products when I decorate my cakes. I LOVE all their products, recipes and project ideas...and I'm happy to report they have a wonderful Web site.
One of my favorite resources on their site is their Decorating Techniques section. Basically, they have a huge list of what you can create. They've even separated the list into what you can do with fondant and buttercream frosting. They give great step-by-step instructions and have beautiful pictures.
Tonight I'd like to talk about tip 2D, for drop flowers. I've used this tip for a number of cakes and cupcakes. It is by far the easiest tip of all, especially considering the lovely outcome! You can make these flowers to top a cupcake, make a border or cover an entire cake like I did below. You'll also need a number 3 or any small round tip to fill the center of the flower. Click here for Wilton's instructions!