Acid Free Tissue Paper?
Have you tried dry cleaners that specialize in preserving wedding gowns or christening gowns, etc.? I would think that they may either have it or know where to get it.
Decorating Plastic Milk Jugs?
Make a fabric sack or just wrap some pretty fabric around it & tie with a pretty ribbon :) You could also put some nice artificial flowers standing in it. Fill with sand & make a great & attractive doorstop!