Update 2:
At ~66,500 miles I installed grille block 3.0, made of spraypainted coroplast, a pair of zip ties and some double-sided automotive tape (to hold the corners down). Here's a closeup, featuring paint chips from road debris and what looks like a huge gap just under the emblem (in real life it's not nearly that bad. Think of it as an unflattering angle.).
From a distance, it actually looks pretty good.
Version 4 will be a bit cleaner, and will have a large Ecomodder.com logo across it