I used planetary energies and alchemical associations to temporarily alter the colouration of the irises of my eyes. Basically, with only meditation and visualisation, I made an actual physical change to my body.
I wanted to put a silver ring just inside the outer edge of my iris, to see if I could. I first filled my eyes with solar energy to be used as fodder for transformation, then I flooded them with lunar energy (because the moon is aligned with the metal silver) with the intent to enact the change I wanted. I phrased it as “enact the change to last until I decide to undo it”.
For a first real attempt at changing my physical being using occult stuff, it worked out really well.