To pack smaller pictures and frames, you can use a medium-sized moving box that is clean and its bottom solid. Always make sure that the box is slightly larger than the frame you're packing. It is better to use specialized cardboard protectors. Like Chris has already said, I don't think Glassine is a good choice. I will recommend HDPE anytime since it can handle any pieces of stuff neatly. Or you can go to any custom crating services if you like to. But, I guess they will also use the same techniques.