It looks like more than 60% of the Kurgan (including Scytho-Siberian) samples successfully tested here for pigmentation markers were blue or green eyed and fair haired:
In the present study, a multiplexed genotyping assay for ten single nucleotide polymorphisms (SNPs) located within six pigmentation candidate genes was developed on modern biological samples and applied to DNA retrieved from 25 archaeological human remains from southern central Siberia dating from the Bronze and Iron Ages. SNP genotyping was successful for the majority of ancient samples and revealed that most probably had typical European pigment features, i.e., blue or green eye color, light hair color and skin type, and were likely of European individual ancestry.
The Y-DNA haplogroups reported for the ancient individuals include seven R1a1a and a single C (xC3). On the other hand, the mtDNA results show a lot more variety, with the following haplogroups present: U2e, U4 (2 instances), U5a1, H or U (3 instances), K2b, H5a, HV, T1 (2 instances), T3 (2 instances), T4, I, C (2 instances) F1b, G2a, N9a and Z.
The majority of the males who belonged to Y-DNA haplogroup R1a1 were very similar in terms of the few analyzed nuclear markers to the European reference population (Utah Americans from the HapMap project). On the other hand, the individual with haplogroup C clustered close to East Asians (HapMap Han Chinese and Japanese), along with another sample for which a Y-haplogroup assignment wasn't available.
Caroline Bouakaze et al., Pigment phenotype and biogeographical ancestry from ancient skeletal remains: inferences from multiplexed autosomal SNP analysis, International Journal of Legal Medicine doi:10.1007/s00414-009-0348-5
Ancient Siberians carrying R1a1 had light eyes - take 2