This Lent, I preached on the plagues against Egypt, using the excellent midweek series written by Sober Peasant in 2010, which he based upon articles in 2002-3 by Rev. Karl Fabrizius for Gottestdienst.
Here are two thoughts:
Gnats - The magicians try to copy this one - and fail. Only God can create life from nothing but dust. He did it with Adam. And when our body returns to the dust, for dust we are, He will resurrect us out of our dust!