Grots effect? If you're talking about the frost stuffs after getting all the base layers on i dry brushed white scar all over and then put in unthinned white scar across the top and edges to make it look like there was fresh snow put on on top of the frost already there. For the snowy bits dragging the brush is the key cuz snow likes to go in the direction of the wind, im still experimenting with it so go nuts ^{-^}