Do you mean icing or fondant? Are you looking for realistic or cute? I can't do realistic icing flowers, but I have done some that were pretty cute out of fondant. I got the wilton fondant flower kit and the first(?) lesson was apple blossoms. I haven't looked at an apple blossom for a while, but they're cute-the little girl next door just loves them.
Here's the wilton how-to link on apple blossoms and a number of other flowers and decors.
http://www.wilton.com/decorating/basic/index.cfm
I have a cake in my photos with cherry/apple blossoms on it in my gallery. I rolled out white gumpaste, used wiltons medium 5 petal cutter to cut out the flowers. I thinned out the petals a little to make them more natural. I lied them on a small puft of cotton coated with corn starch to dry. The I colored them with petal dust, and added wiltons yellow stamen. Attached a wire and there you have it. Really not to hard.
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