Positive energy is part of Nicole by OPI's permanent collection. Positive energy is a shimmery silver. Retailers can be found here.
Although there is nothing particularly special about this silver, I LOVE it, full coverage in 1 coat? wow. Positive energy isn't streaky, had the right metallic shimmer and the formula was smooth and opaque. If you're looking for a normal silver for your collection, you've found it!
Check out http://nicolebyopi.com/ for their blog posts and full list of products.