So the crown of thorns (the cover of Hurt by Johnny Cash comes to mind, check it out) is a famous symbol, so I thought I would provide it here for anyone who needs it.
This is a completely free image Crown of Thorns - Frame that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.