Rhythmically Displaced Intervallic Pentatonics (say wha...?!)
The real reason we practice in the first place, as improvising musicians especially, is to ultimately obtain the split-second facility to make musical choices - and to make them musically. This requires not only the ability to hear and execute the "right" notes at the right time (melody), but also the innate feel for creating balanced and coherent rhythmic statements (phrasing).
Let's take a look at a few simple ways we can turn a potentially monotonous exercise into something more listenable.