You can mark out prospective pathways with hosepipes, as Geoff says, or with dry sand poured from a bottle as you walk. You can then use them for a trial period and view them from all angles including upstairs windows before committing yourself.
If you want something more permanent initially you will have to bite the bullet and buy paving slabs or cirlces or stones of some sort and position them as you wish then set them permanently in concrete when you're happy you've got it right. I can't see that a loose path made from stone cippings or chipped bark will be compatible with hens as they will constantly rearrange the material.