I love this project because is easy and clever. You can adapt it to your idea simply changing the size of the box or the kind of fabric you use or the interface weight.
I love it because is a gift of a friend...thanks Elena!
You need 4 strips of different fabrics (or half and half ,as in my example, if you want the effect inside different from outside) and four strips of interface (same size).
REMEMBER...you will obtain a box that is a cube with (about) the same size of the width of the strips you use. So , if I use strips 4" width , the box will be a cube 4"x4"...
For a tiny box 4 fabric strips 4"x 13" (10x34 cm) and 4 interface strips in the same size
For a medium box 4" and 3/4 x 17" and 1/2 (12x44 cm)
For a big box 6"x 19" (15x47 cm)
Iron the interface on the back side of the strips. Choose the interface weight you prefer ( just remember that a high weight interface will be better if you use it only on the outside half part ).
Okay, we are ready to start...
mark with a dot the middle of the short side of the strips...
...put the ruler with the 45° line on the long side of the strip and shift it until you meet the point in the middle on the short side (as in the pic)...and cut out the corner...
...repeat the same step for the other side and then for all the 4 strips until you will have pointed strips (as in the pic below).
Start to sew from the middle of the long side and go straight towards the side corner
Stop the seam at 1/4" (0,6 cm) before the corner and bend towards the point...
...go straight to the point and stop again the seam 1/4" before the point and stop the seam with few back stitch.
Repeat for each side, leave a little open on the last side to turn inside out the finished box.
Stitch the part left open , press the project and put the inner part inside the outer.
Turn out the edge and the box is done!
Hope the tutorial is clear and useful, but, as you know, English isn't my language...so, forgive me and my mistakes and , if you need some more explanation , please, mail me!