Patch a random from Pams (or an LFO from Maths) into Plaits Model input while triggering Plaits at a rythmic interval
+1 on utilities to get more out of this rack. Some suggestions below
Adding some random always makes things more interesting. MI Marbles, SSF Ultra Random or Frap Tools Sapel are just a few of the best at random. A sequencer like Mimetic Digitales that can be randomized would be a great source to add stepped modulation and interest to all the voices
There are some great multi-fuction modules that encourage creative patching. Maths is one, but Muxlicer, Stages and Tides also pack a bunch of different capabilities into a single module
If you're looking to work more 'in-the-box' Expert Sleepers ES9 audio interface is awesome for building a hybrid system with VCV rack. VCV alone will open a world of possibilities. Bonus ES9 feature is the MPC can use it to expand it's audio I/O and sample directly from the modular (depending upon the MPC firmware)
Lots of little utilities add flavour, consider adding things like a sample & hold, clock multiplier/divider, sequential switch and CV attenuation/inversion/mixing