My eyes changed color from light blue to dark brown naturally from having both genes, but I did not meditate and it drove my father mad because he wanted a blond son with blue eyes like himself.
Meditation can unblock supressed attraction from taboos or societal peer pressure, alter blood flow, temporarily increase intelligence, sharpen senses, et cetera. But eye colors are dictated by how DNA generates RNA, so it might require super expensive gene research and a dangerous change of nutrients if the right condition is found. I would not recommend creating a vitamin D deficiency just for a temporary change, because you would become sick before even noticing a difference.