color outside the lines
Verb
Meaning
(intransitive) To behave in creative or unconventional ways, to break the rules.
Used other than figuratively or idiomatically: see color, outside, lines.
Source: en.wiktionary.orgExamples
The script is the coloring book that you're given, and your job is to figure out how to color it in. And also when and where to color outside the lines.