Gold Foil is a golden foil polish. It's super opaque and really good for stamping. Actually that's the main reason I wanted this one in my stash. I haven't used it as much but I have some plans for it. mostly for stamping.
It's opaque with one coat but I used two coats for these pictures to smooth it out.

Croc Nail Effects is a black crackle. Unlike most crackles it has a glossy finish and it's cracks are spreading in various ways, what helps to create this croc like look. Another thing that's different about this one is that it takes about 2-3 minutes to complete the crackle effect, which was really surprising as for most regular crackles it takes much faster and the process begins when you apply it on the nail. I used one generous coat on top of the Gold Foil to create this look. The cracks will appear more delicate if you apply a thin coat of the Croc Nail Effect polish.