To enhance the flavor of something by adding spice to it.(verb)
To make more exotic, fun or extravagant.(verb)
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Use "spice up" in a sentence
"Moreover, nothing is more transparent than inauthentic expressions of faith-such as the politician who shows up at a black church around election time and claps (off rhythm) to the gospel choir or sprinkles in a few biblical citations to spice up a thoroughly dry policy speech."
"A brick path wanders through the garden to the front door, past Japanese knotweed and gunnera, an English jungle John Nash introduced around the margins to spice up the poplar, oak and hazel."