How is eye color in humans inherited?
It is mainly determined by the OCA2 gene, but it also likely involves several other genes, including TYR, TYRP1, HERC2, and several others. To complicate things further, it is not a "mutant/wild type" trait, but multiple normal alleles can be found in the population, and it is believed that the sum of these single nucleotide polymorphisms (SNPs) determine the final phenotype. 

I took the info from a 2004 review by Sturm and Frudakis and a more recent paper from Liu et al, 2009