I don't recall seeing Fulvia swatches for carpet options ... only ones for upholstery (who could resist the fur option on a Fulvia Sport

)
I think for the S3 things got a little more adventurous than black ... I recall seeing a rather nice funky green interior in a Fulvia at a car meet. But on 1600 HFs I've only noticed black carpets.
In lieu of other answers then you could just use a google image search for
fulvia interior and see if any other options appeal. However if you have the run of a carpet specialist's catalogue you can go wild!
