Songs Made From Loops (Within DAW) Make Great Vehicles for Improvisation
Within your DAW (Digital Audio Workstation) software, there typically exists a media library full of various midi and audio loops. When searching for something new to improvise over, I occasionally leverage these loop fragments, combine them into a song and hit it! Sunday afternoon (weather and sports permitting) I usually find myself in the mood to practice phrasing or improvise.
Here's a mis-mash of audio loops in Eb combined in Cubase v8.5.