It is said that genius and insanity live on the same street, next door to each other, in fact. I don't know if that's true, but my brother, Trester suffered from schizophrenia for many years and in the process created many ideas that might be of use to the world. He wrote what he called "Headline Cards," notes on 3-by-5-inch cards. Most of these were imagined news headlines, such as "Whole Area Bombed Here Again." But occasionally, he wrote down some ideas for products, stores, foods, and so forth.
Here, then are a few ideas I've gleaned from his note cards. They might not be unique, but they might also be of use to stimulate further creative ideas. I've taken the core note and expanded it to clarify what I thought was his own idea and then added my own thoughts to it.
As a gift from my now-deceased brother, these ideas are in the public domain. To expand these ideas, I'm available as a consultant.
1. Ancient Days Restaurant. Create a theme restaurant with multiple rooms, each of which serves authentic food from historical eras and locations. For example, the 1,000 B.C. room would feature the breads, soups, and stews and barbecue eaten in, say the middle east at that time. The 1,000 AD room would feature robustly spiced mutton stews and so forth. More fun might include a Renaissance, and an Eighteenth Century room, and maybe a 300 B.C. China room. Period decor (clothing, farm tools, weapons, cooking utensils) would enhance the experience. Tabletop TVs could show short films discussing the historical period and tying menu selections to the history (thus encouraging people to try the dishes).
2. Soap for the world. Develop an anti-bacterial soap that is effective in cleaning, mild to the skin, and biodegrades easily and quickly. Market it as (1) good for you and (2) good for the world. For every bar (or 2 or 3 or 4) purchased, another bar will be donated to third and fourth world countries where a lack of hygiene is a cause of so many ailments.
3. Medicated Floor Cleaner. Develop a floor cleaner that contains, say, menthol and eucalyptus oils, so that a hospital or sick child's room can be cleaned with it, leaving the nose-clearing aroma in the room. Another angle on this is to combine an antiseptic or antibiotic chemical with a floor cleaner, so that two kinds of cleaning can be accomplished at once. A third possibility is to combine an aromatic substance with the floor cleaner so that when floors are cleaned in third-world countries, a mosquito repellent will be laid down as well. (You might need to sponsor a "Concrete Floor Project" in tandem with this, for areas where floors are still dirt.)