Justin mentions this more than a few times.
ie. taking something you’ve learnt, and experimenting with it, modifying it, making it your own.
Not just great for creativity, but also for knowledge development of the fretboard, intervals, melody, rhythm etc, etc. A great use of one’s guitar time I reckon.
David Brewster, from YT channel Late Night Lessons, takes a bit of a dive into this area, using a specific example. David’s got a real cruisy delivery, and there’s some great stuff here over the 15 minute video.
Well worth a watch
Cheers, Shane