I have been experimenting with lazy ways of making the hallucination goggles. At the moment, its fairly easy to mass produce electronics, so thats not an issue. The main annoyance is building suitable goggles themselves. The only requirement is that enough diffusing media needs to be placed between the eye and the LED in order to create a uniform stimulation of the entire visual field. Today I experimented with pouring various mixtures available at your local KMart into cheap swimming goggles, also from the local KMart.
The overall idea is to get some clear liquid plastic that can be poured into the goggles, and to get some sort of powdered or granular substance that can be mixed with the liquid to make it diffuse light. Technically, any clear granular substance would work since you only need to create a heterogeneous index of refraction in order to scatter light. I tried both PLA ground in a coffe grinder and table salt. For liquids, I tried silicone and clear 5 minute epoxy (5 minutes is quite necessary if you want to be able to get a smooth finish. Anything else cured before I could pour it. Make sure your epoxy mix is clear, not yellow. ) You don't need much of whatever you're adding to the liquid to make it diffusive. I would say no more than 25% of the total volume. I used about a teaspoon for one pair of goggles.
Silicone mixed with PLA that had been powdered in a coffee grinder did not work. The silicone was much to viscous to pour or mold properly, and the PLA flakes were too large and hard to mix.
Epoxy mixed with table salt seems promising. The table salt doesn't seem to effect the curing of the epoxy.