There are several synonyms for the phrase "playing around with." One alternative is "experimenting with," which suggests a more deliberate and focused approach to testing and exploring new ideas. "Tinkering with" is another option, indicating a playful and iterative approach to trying out new ideas and making small adjustments along the way. Similarly, "toying with" often connotes a more casual and exploratory approach to trying out new things, while "fiddling with" suggests a more hands-on and tactile experience. Ultimately, the exact synonym to use for "playing around with" will depend on the specific context and tone of the writer or speaker's intentions.