Surface of the Sun Texture
This Corel/Photoshop created texture resembles the boiling surface of the sun texture.
It also has a sort of impasto paint look, which makes it useful as a fine art texture - simply destaturate and set the layer mode to Soft Light or Overlay.
Better yet, use it as a discplacement map to give an impressionistic painting look.
At 3529 x 2496 pixels it's large enough for printing A4 at 300 dpi.