To put textures on a brush, first load the textures by pressing 'L' and selecting pball. Then select the brush you want to put a texture on, select the texture, then press alt+b to apply it to the brush, or alt+f to apply it to the selected face. As for ice, select the brush you want to be ice, press 's' (surface properties), then select 'slick' and press 'apply brush'.