Most here know that story elements in the Jesus story are drawn from the OT. Countless elements of Gospels are cut straight from the descriptions of OT characters like Moses, Joshua, Samuel et.al. An interesting suggestion involves a passage that was the very last straw for me years ago. The last meeting I attended Judges 9 was in the weekly Bible reading. The bizarre story inserted in the text has 4 plants discussing who should become king. Fig tree, Olive tree, grape vine and thorn bush. The verse that I found just so over the top obviously wrong was when the vine says:
‘Should I give up my wine, which cheers both gods and humans, to hold sway over the trees?’
But that's another story. The point of this thread is the conclusion. The thorn bush accepts his role as King but pledges fire upon anyone who resists him.
8 One day the trees went out to anoint a king for themselves. They said to the olive tree, ‘Be our king.’
9 “But the olive tree answered, ‘Should I give up my oil, by which both gods and humans are honored, to hold sway over the trees?’
10 “Next, the trees said to the fig tree, ‘Come and be our king.’
11 “But the fig tree replied, ‘Should I give up my fruit, so good and sweet, to hold sway over the trees?’
12 “Then the trees said to the vine, ‘Come and be our king.’
13 “But the vine answered, ‘Should I give up my wine, which cheers both gods and humans, to hold sway over the trees?’
14 “Finally all the trees said to the thornbush, ‘Come and be our king.’
15 “The thornbush said to the trees, ‘If you really want to anoint me king over you, come and take refuge in my shade; but if not, then let fire come out of the thornbush and consume the cedars of Lebanon!’
Its not hard to see the writer here was drawing on the Moses and burning bush story. But had the writer of Mark drawn upon this quaint parable for the crown of thorns detail in his story? I know some have also seen a solar element in the crown with rays/thorns, and solar motifs do lay behind certain theophanic descriptions of Jesus but I think the writer in this setting was drawing specifically from OT passages to have significance to more initiated readers. The author's King fittingly wears a crown of thorns (as opposed to figs leaves or olive branches) to hint at his offer to provide shade or face his fiery anger.