Yes, in general you can do anything from PyPlot that you can do from
Matplotlib, because PyPlot is just a thin wrapper around Matplotlib using
PyCall, and PyCall lets you call arbitrary Python code.
The "pyplot.style" module is not currently exported by PyCall, you can
access it via "plt.style":
using PyPlot
plt.style[:available]
will show available styles, and you can use the ggplot style (assuming it
is available) with:
plt.style[:use]("ggplot")
(Note that foo.bar in Python becomes foo[:bar] in PyCall.)
Then subsequent plot commands will use the ggplot style.