Line a baking sheet with waxed paper. Arrange pecans in a cluster of 5-6 halves
In a small saucepan combine caramels, milk and vanilla. Heat and stir over medium heat until caramels are melted and mixture is smooth. Don't let them burn! Spoon caramel over each cluster of pecans. Return saucepan to heat periodically if your mixture starts to harden before you've finished all your clusters. Let stand for about 30 minutes or until firm.
In a medium saucepan heat and melt dark chocolate pieces over low heat until chocolate is melted and smooth. Set aside about 1/4 cup of melted chocolate in a resealable plastic bag. Spoon remaining chocolate over clusters and gently spread to the edge. Let stand for about 30 minutes or until firm.
Meanwhile, chop white chocolate into small pieces and melt in microwave uncovered for about 1 minute, stirring every 20 seconds. Spread white chocolate over tops of clusters.
Microwave the plastic bag you reserved the dark chocolate mixture in for 20 seconds. Snip a tiny bit off one corner and drizzle over the top of each cluster.
Finish by sprinkling fleur de sel over each while drizzled chocolate is still soft.