Model making is not really a hobby, more a way of life. I'm always looking for materials to store for future models.  I have boxes and boxes of plastic parts and scraps of material, it becomes habitual to look at everything I am about to put in the bin, just to check if I can't think of what it could be useful for.  So recently I have become very interested (possibly slightly obsessed) with the packaging that comes with raw meat.  The plastic boxes that hold your chicken thighs and wings are full of amazing patterns, useful for all sorts of model details, handgrips, watch straps or if you have kids, making superhero body armour.  The possibilities are endless, (I wish I had found this when I was working on the head lamps for my car) just make sure you wash it thoroughly before re-use!