As a vegan, I'm always experimenting with recipes - taking ingredients out and seeing what works.
I did this with pancakes - took the eggs out, and found no difference in the result. Then I made it with water instead of milk - again, it worked. So then I removed the sugar and was left with flour (s/r) and water. And again, you can't tell the difference.
So now I make pancakes which cost about a penny each instead of about 10p each. And these are available to everyone - including those with egg or dairy allergies.
Then I looked around to see what else can be made with flour and water and discovered soda bread (which I've been making for years), homemade pasta - and only this morning I made some tempura which we had for lunch. Not to mention pikelets - both plain and fruited!
So simple - and so cheap!
Here's my blog post on the subject, with a few links:
nobreadisanisland.blogspot.co.uk/2013/05/what-can-i-make-with-just-flour-and.html