As you can see I made a badly sketched effort at outlining what I'd be sewing. :D
If you're not familiar with piecing, I'd have a look at my how to sew a quilt
instructable - I won't be as in depth for this one.
For the four square block you need:
2 4x4 inch squares one color
2 4x4 inch squares of a second color
For the 12 square block you need:
4 3.5x3.5 inch squares of primary color
4 4x4 inch squares of primary color
4 4x4 inch squares of the stripe color
Any of the 4x4 inch squares will be cut in half diagonally. While I've used bold colors for all of mine, You can also use tans or whites for the background and random colors for the stripes. :)
You'll also want a cutting mat, rotary cutter, sewing machine and clear ruler for optimal awesomeness.