Cubes can come in many sizes and have a wide variety of uses. Many materials can also be used to form a cube. No matter what materials are used or size of cube desired, all cubes can be made the same way and share the same characteristics. Cubes are geometrically defined as a polyhedron containing six square surfaces of equal size. The cube will have eight points and 12 edges when assembled properly.
Things You'll Need
 Six equallysized squares
 Appropriate adhesive

Create a vertical strip of four equalsized squares. Number the squares 1, 3, 5 and 6 from top to bottom, or farthest away to closest.

Create a horizontal strip of three equalsized squares by placing a square to the left of square 3 in addition to a square to the right of square 3. These will be numbered 2 and 4 respectively. The resulting pattern should resemble a cross.

Create the cube by folding up squares 1, 2, 4, and 5 using square 3 as the base. Place square 6 on the open edges of squares 1, 2, 4, and 5 to form the top of the cube.

Seal the exposed 12 edges of the cube with tape, caulk, glue or other appropriate adhesive compatible with the material used.
References
 Photo Credit cube image by drx from Fotolia.com