So I saw these disc simulators on Ebay for $10, and I thought, 'Hey, why not?" They are thin aluminium, and installed very easily. I think they look pretty nice. Just thought I'd let you guys decide for yourself. They come in many colors.
Aumo-mate 2pcs Universal Auto Car Wheel Disc Brake Racing Cover (Silver)
Race Sport Original 2pcs Universal Auto Car Wheel Disc Brake Racing Cover, 10" diameter.
DealMux 2pcs Universal Aluminum Alloy Auto Car Wheel Disc Brake Cover Plate Sliver Tone