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It really depends on the person's style, but something that always works is keeping it elegant and not too childish: fresh fruit, melted chocolate, nuts, or a smooth, well-executed glaze already makes it look professional. If you want something more personal, you can write a short message with melted chocolate or add edible flowers that give it that sophisticated touch. The important thing is that the base and flavor are well done, because then any simple decoration looks good; I've seen basic cakes that stood out because the sponge was moist and the filling was really good.
I always make cakes for my colleagues' parties and honestly, you don't need anything complicated - adults appreciate elegance way more than loud colors! Try white or cream fondant, add fresh flowers (roses or lavender look gorgeous!), or if you want something more personalized, write a nice message with contrasting icing or place macarons on top. If you're not feeling confident with advanced techniques, a super pretty alternative is decorating with fresh fruit, toasted nuts or even a drizzle of melted chocolate - all of that gives a really sophisticated vibe without much effort!
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