After seeing this thread, i went out to the garage and found some 1/2" mesh (it will be heavier duty than plastic gutter guard, imo)... it comes in a large roll, so i was able to use one peice to cover the grille. I painted it flat black (it came galvanized). The grille was realle easy to pop off... took maybe a minute, all I did was give each plastic screw a few turns then pulled them out by hand, then the grille pops out at the bottom, unplug the two park lights and you're done! I followed the same procedure as the others, using the plastic retainers and zip-ties... a tip for anyone having problems with the plastic retainers, is not to use a screwdriver to pry, but use a pair of sidecutters get under the washer/head and pry them up gently...you won't mess them up that way.
here is the finished product, too bad I took a pic after I got the jeep all dirty this week!