We have tons of denim jeans at home that we no longer use.
I have found this old jeans quilt tutorial bySewVeryEasythat is exactly what I needed.
Watch the video below for the full instructions.

Image by: SewVeryEasy
Materials:
If you are going to buy denim, you need 2-1/2 yards.
Use a denim needle for this project.
Next, get one 5-inch square and place it in the middle of the square.

Stitch the edges of the middle square and sew an X on the middle.
Do the same for the remaining 40 pieces.
Step 2:
Sew the flannel triangles to the denim triangles with the wrong sides together.

Step 3:
Assemble the blocks in this sequence 1, 3, 5, 7.
These numbers indicate the number of blocks for each row.
Once you complete them, it will look like a triangle.
Make another one of this.
Next is the joining row which will be in the middle of these 2 triangles.
Next, fill each edge with large denim triangles.
As you fill the corners you will see the triangular shape.
Step 5:
Start with the top block and triangle.
Quilt by putting the wrong sides together.
Once done, trim off the excess.
Continue with the second row.
Align the two side blocks to the middle block.
Put wrong sides together then sew.
Remove excess then sew it to the first block.
Do the same process until you are done with the first big triangle.
Repeat for the other big triangular blocks.
Step 6:
Get 9 blocks and put the denim triangle at the corners.
Once done, sew this row in the middle of the two big triangles.
Step 7:
Press the quilt using iron and trim the excess edges.