I didn't even LIKE Butter London's Black Knight very much, but as soon as I saw it I thought "that looks like Rockstar Pink with a black jelly base!" so I HAD to try it.
Mid Knight - my BL Black Knight Franken-dupe
Unfortunately, I don't have the original to compare the two (in fact, the whole point of frankening it was to avoid paying $25 for the set). However, I think it looks close compared to Scrangie's swatches. In fact, Scrangie's post made me run off to ebay to buy the other half of the collection, Tart with a Heart, just to go with my franken... oh well.
The best part about this?? It is SOOOO easy to make at home! I started with a base of China Glaze Liquid Leather (about half the bottle), and added in Sally Hansen Xtreme Wear Rockstar Pink. Because it didn't have quite enough blue in it, I added a little tiny bit of OPI Absolutely Alice. The only one of those that isn't readily available is the OPI, but it is easily substitutable with another fine blue glitter like Pure Ice Strapless. So there you have it - a cheap, easy way to get the Black Knight look!