If you have a top flap, you could put the snowshoes under it, I think that is how Fred might of strapped them on. However, for bushwacks through narrow trees, that isnt the best option as they'll tend to hit branches and stuff.
I've found for bushwacking, getting the snowshoes on the sides of back as low on the pack as possible works best. Definitely use some kind of 'biner or strapping to lock it on the pack so it doesn't get knocked off. If the snowshoe is too high and/or over your head, it'll get caught in low branches alot and will be a pain to keep freeing it.
If you find a daypack that is made for a snowboard, typically you can use that for snowshoes too. My Dakine Guide is like that, has diagonal ski carriers but also a verticle snowboard carrier system that one can use for snowshoes.
I recommend the Dakines if you like gadgets and lots of straps! The Guide is like a neat winter pack that was designed by Q from James Bond, I think. It actually has a manual for it on how to use all the various straps and stuff.
Jay