Several miracles were credited to him, among them the restoration of a dead boy to life. En route home to Scotland after being made a bishop, Blane travelled through England where, on his way through Northumbria, he was told of the death of a local prince. The boy's parents asked him to pray for their son and Blane, on touching the boy, brought him back to life. The parents gifted lands in Northumbria to Blane who gave them to the Scottish church. These lands stayed in the possession of Scotland until repossessed by Edward I, after the defeat of King John Balliol in 1296.

One legend tells that Blane lit tapers with sparks from his finger-tips, and another that he returned to Bute from Rome taking steps of 3 leagues (about six miles) and his final step took him from Ailsa Craig to the site where the ruins of his monastic chapel now stand. Such extravagant tales about the early celtic saints were very common.