Making a pair of emergency snowshoes to get to safety is extremely simple. It's surprising how many people try to get to safety in knee deep snow and drop from exhaustion.
Find two stocky branches about 3 feet long with plenty of small branches and plenty of green, preferably from a fir tree but other trees will do if there are no firs in the area.
Tie one branch to each foot at the front end of the branch as in the picture. Thread the string through something on the front of your boot otherwise your foot will slip out of the binding. Make sure your foot can swivel enough to walk.
That's it, you're ready to go!