Wyatt "Spooky AF" White

I think I need a better way of spawning the floor snow, currently i'm just picking a random spot in the screen, checking if it's free then trying another place a set number of times. It works but as the valid spots decreases the spawn chance drops leaving gaps like those three you see to the right of the house. I suppose if the previous method fails, I could pick a random snow and make it spread if there's a free space? I'm hesitant to check if ever space if free because it's slow, and it would be bias to wherever you start, i.e Top-left.