Femo and Sculpti polymer clays can be mad into just about anything, so roll out some warmed clay, drape over a cardboard form, or actual hood, with a 2:1 thickness for where the hood will join with the lens, and let it stand in a freezer or fridge to more quickly 'set' so it can be handled.
Once baked, in a 220f oven for 20 minutes or so (follow package directions) allow it to cool air temperature, you'll see about 3% shrinkage, and
Personally, I would use a glassless filter ring, the correct size, and after cutting a good fitting hole to support the filter ring, marry the two with a very strong epoxy or super glue, that can adsorb shocks without sheering off.
If you want shinny sides to the hood, use tin foil, shinny side in, pressed against the outsid sides tightly.
though, personally, I prefer matt black.
With this material, you can chose just about any colour you'd like, to personalize the outer results, however, the inside should be lightly sanded, and even with black clays, given one or two coats of Golden Acrylics "Matt Carbon Black, with or without matt medium.
You can also layer black clay sheets with coloured clay, on the outer side clay, when making up project material.
You may want to lightly brush clay medium, found with the clays at craft-stores and Wal-Marts, to better join the two sides, before rolling them together.
It's no expensive, nor is the clay (be sure you're no buying Jeweler's precious metals clays) and the last thing I recommend is buying a set of clay makers blades, about 4" long, IIRC, for good, clean cuts.
This is a fun material, and you can do all kinds of things with it; long ago when my boys were little, I'd make little figure head creatures over the turning grip on keys, so they knew which key on my key ring was to open the front or back door with, as well as Christmas ornaments, and more serious stuff.
If you try this, post the results so we can all see what you've done and to inspire others.
One last thing that is camera related; there is a rubberized version of this polymer clay, and when properly sealed, (Plasticizer in the clay can leach out and soften other polymers) you could make a case bottom for a camera, without strap lugs, and just add your own.
Its been many years since I've bought these type clays, ( I still have a stock of them, unopened in, sealed containers, so be read up on whats out there now and be sure of strength and flex issues, but it can be done, even if for just Halloween fun.
Be Well, Be Safe, and Godspeed to all.
It might work on others too ...
