I recently had this idea for a game when I started playing Tycoon Online again (http://www.tycoononline.nu/), which is a Swedish browser based game where you run a business, building factories, hiring staff, buying land, trading shares etc. And I thought 'hey, a business based game could be fun in BYOND'.

Players start out by selecting a starting industry. As long as you can afford equipment, there's nothing stopping you from changing later or having multiple industries or whatever.
Then, players use their equipment to collect resources or produce finished goods, either playing short minigames to get a bonus or whatever. Materials can be sold to NPC material traders, or to other players for producing products.
Once a player has saved up enough cash, they can buy land to build factories, or buy areas of natural resources and tax money from people using them, or build resource extracting rigs like logging camps or fishing harbours.
The game world will be persistent, and once the player has a factory, goods are produced automatically (although the player will still be required to get raw materials or move finished goods around).

I haven't got all of the details yet, and I need to think of a lot of minigames to add in to make it interesting, but I want it to be the sort of game you can play for 15 minutes, or 2 hours, and still get something out of it (i.e., enjoyment).