Of course we are using the soup bones that we got at part of our grass-fed meats, and the recipe we found was really quite simple (I'll have to ask the Mrs for the link she found). The only ingredients were were missing was bay leaf and garlic, but everything turned out beautifully. Here are some pictures of the before and after of our homemade soup/broth.
I found it interesting how the marrow completely dissolved into the soup leaving the bones hollow. On the advise of the recipe author, I am saving the bones in case some friends would like to give their dogs a treat.