Antonyms for the phrase "cutting frills" could include "adding embellishments," "ornamenting," or "adorning." These words suggest a desire to decorate or beautify something, rather than simplifying or streamlining it. Other antonyms might include "complicating," "over-designing," or "cluttering," all of which indicate a tendency to make things more complex than necessary. Ultimately, the choice to cut frills or to add embellishments will depend on the desired outcome and the intended audience. Whether one opts for simplicity or extravagance, the key is to create something that meets the needs and expectations of those who will interact with it.