I've done a little more cosmetically- grandma style floor "rugs" and a Nardi steering wheel for the interior. The clear was badly faded and flaking on the hood so I fixed and primed a couple spots and wetsanded it in preparation for paint. The base coat I bought ended up being way off. I had my first autocross the next day so I shot a couple coats of clear to seal it up until I could get the base tinted to match. The "fake patina" look turned out to be a hit at the autocross, so it may stick around for awhile.
I picked up a Yakima roof rack at a flea market for ten bucks, bought the correct clips on eBay cheap, and shortened the load bars so they looked more proportional to the size of the roof. I also swapped the silver painted center caps out for a set with brushed stainless outer rings and black centers.
The woven floor rugs.
And the Nardi wheel.