Steven Johnson has developed a new way to describe possibilities. He says that next to every idea is the next possible idea. If you see a great idea, all you have to do is look around, and you'll find plenty more.
Wall Street Journal: The Genius of the Tinkerer: The secret to innovation is combining odds and ends, 2010-Sep-25, by Steven Johnson
The adjacent possible is a kind of shadow future, hovering on the edges of the present state of things, a map of all the ways in which the present can reinvent itself. The strange and beautiful truth about the adjacent possible is that its boundaries grow as you explore them. Each new combination opens up the possibility of other new combinations. Think of it as a house that magically expands with each door you open.