Business ideas

furoshiki (Japanese wrapping cloth)
- Doubles as hijab! 🧕
hourglass set
Raspberry Pi + special OS with fun web apps and instruction manual
Smart lava lamp
- lava lamps take about 1 hour to start working and need to be shut off after 6 hours
E-paper PDA (calendar, clock, alarms, address book, MP3 player, flashlight etc) that also serves as a offline RSS reader / pocket size ebook (use USB-C to charge/sync)
Heated dakimakura
- Like an electric blanket, but more weeb-friendly. Good for the winter.
Tower of Hanoi flashcard set
- The classic recursive math toy, but one can insert cards with things like constellations, moon calendars, conversion tables, etc into clear plastic disks. Pragmatic.