Granny Square Bag

Here is a really simple idea that I found a while back...

 Just take three granny squares that are the same size...

 Fold them in half diagonally, sew the edges together (as shown below) and add a handle to make a bag! I'm sure you could use blocks other than granny squares to get a unique designs. For my squares I decided to change colors every two rounds...

You can also use an extra square to make a flap as shown  here (the place I originally found the pattern)