I thought I'd have a look, as I do once in a while and two 'new' styles have popped up that I thought I'd bring to your attention.
1. First up, a Vorsteiner copy I believe, isn't it?
http://www.ebay.co.uk/itm/MCF-BMW-E8...item3ccdbb2d2f
2. Next up, Louiellp has had a go and making their own. I've never seen this style before; kind of looks like iCarbon crossbread with something else.
http://www.ebay.co.uk/itm/08-10-BMW-...item1c1fd48b34
3. There's also this. The picture is bad but it kind of looks like Hamman mated with Slek; as in the middle part appears to meet with the bumper as does Slek, it stick forward as does Slek however, it has small fins at the side as does Hamman.
http://www.ebay.co.uk/itm/07-11-BMW-...item2a22890ed5
Edit: actually on the last one forget my comment, it's just a cr@p photo showing a cr@p Hamman copy.