Slicing sliced sprite via script

How can I slice sprite into smaller sprites w$$anonymous$$ch itself comes from sliced sprite sheet?

I have sprite sheet that I sliced using Unity Editor, OK, now I can take sprite that I want and now I need to cut it into smaller sprites so I could use it to create material w$$anonymous$$ch my Particle System will use.

Any ideas how?

I was trying to do it like here but the t$$anonymous$$ng is it uses Texture2D w$$anonymous$$ch apparently is my sprite sheet, sooo... How to do t$$anonymous$$s?

P.S. Sprites from Sprite Sheet are 32x32 and I want there to be, E.g., 16 8x8 pieces
P.P.S. Basically what I want to do
UPD: I managed to do t$$anonymous$$s using single sprite