Lay a strip of carpet on top of some gravel, then pace over it to make a cool walking on snow effect.
– Martin Severn
Flour, great for walking/driving on snow.
– Mark Estdale
Salt in a bucket.
– Paul Arnold
Corn starch – for live shows I don’t even open the bag and wrap it in duct tape.
– Henry Howard
Also check out recordist Mikkel Nielsen’s sound library of real snow footstep recordings.