I learned the basics from taking the Wilton classes, but the rest is just practice and imagination. I don't know if you are like this, but I see cake designs everywhere. I have bought candles, place mats, and pillowcases because I thought they would make good cake designs! Then I take them home and try to make cakes based on the inspiration.
I've gotten a few professional books, but I have to admit I don't open them very often.
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