The inside looks better than the outside on a couple of those! You have your work cut out for you getting around some of those knots, but I thnk the first and second pics, esp have some potential. What's the plan" Sinew backed Native-style, or hickory backed?
The best juniper I have found was never from a whole log or a tree trunk. Rather, I look for big, spreading trees close to the base of a hill or in a low spot. If you fight your way in, the very lowest and second tier branches are very old, long, and reaching out from under the rest of the tree to find sun, thus have greenery only toward the tips. The shaded TOP side of those long branches are often knot free from being in the shade and have been for many years. They can be pretty long, but truly straight sections are rare.