What is the best successful small project idea you have ever heard of?

Thanks for invitation

Mobile Applications producing could be a good idea nowadays.

BPO and idea selling through internet.

Thanks for invitation, and I am really sorry for my late, because I were  had a lot of work.

the idea depends upon the task ,time and budget.,nothing is small,people get injured by a road stone not by a big mountain!

'Uber' in Canada was a great idea in that context which is basically a 'ride sharing program'.

It is in trouble nowadays but I think it was a great small and highly successful idea.

The online apps...making things simpler in various areas of life

>>>>>>>>>>>commerce with the god<<<<<<<<<<< 

 Soft drink shops (Fizzy Soda as they call it here) are a raging success in many cities especially if it's generally hot around there. Great alternatives to Coke/Mountain Dew/Mirinda/Pepsi and the likes, with greater variety of flavours ranging from Jira Masala to Cranberry, etc.

i'm follwing>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

A direct award of contract to competent vendor who has knowledgeable to executes the project on demand target date without variation due to urgency. 

this depend on your country economic and the place you have choose to start your project

and if you will make an online project so apps development is the best till now