Here are some idioms about writing:
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Idioms add color and flavor to writing. They provide more vivid images for the reader.
Idioms are everywhere. If you want a list of them, click the related question below.
Idioms are vivid phrases that make your writing more interesting and imaginative. You create more vivid mental images for your readers.
Conversational writing is a less formal form of writing and would be rife with idioms regardless of what language it is written in.
Authors use idioms the same way everybody else does -- by peppering their speech (writing) with colorful phrases!
Real people use idioms and slang, so writers use them to make their characters more believable.
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You can use idioms any time you are writing informally. Informal writing includes such things as letters or emails to friends, works of fiction, blogs, and so forth. Formal writing would include academic work such as a master's thesis, legal documents, technical writing. If you are writing the instruction manual for a machine, idioms are probably not a good idea. Use your judgment, in any event. If you are writing for an audience which you believe has an understanding of idioms and which would appreciate the informality or color which they would add to your writing, then go ahead. I seldom use idioms when answering questions on this site. People want straight forward answers, nothing overly fancy.
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