A figure of speech is "a word or phrase that departs from everyday literal language for the sake of comparison, emphasis, clarity, or freshness." If you are attempting to change your pattern of speaking to incorporate expressions that go beyond literal meanings, you might want to start by considering techniques used in literature that use given words which carry more than one meaning.
For example: a simile is a comparison between two things that seem different but are similar in some way. Similes use the words like, as if, or such to make the connection between the two items. If your car was running poorly and loudly, you might describe it with a simile by saying, "My car sounds like a stampeding herd of buffalo!"
A metaphor makes a direct comparison between two unlike items. If you were still discussing your car, you might comment on, "My bucking bronco of a car..." to convey how rough the ride is.
Pick a technique you want to incorporate into your thinking and speaking pattern and plan ahead how you might be able to make use of the technique in conversations you are anticipating.