Sans-grille, but it gives you an idea...

(I think this is the nicest photo anyone's ever taken of my car - shame the car isn't in a 'nice' state!

)
I've always thought about bending some sheet metal round, but since seeing it on a mk1, I've hated the idea - just looks too smooth and ugly. Plus, it would kinda defeat the best point about removing bumpers - weight saving.