Create a new file of 740 x 124 pixel. Create new layer and draw a 740 x 86 pixel wide selection from Rectangular Marquee tool. Set white as foreground and #B3D2F0 as background color. Fill the selection with the help of gradeitn tool from top to bottom.
Press 'D' to change the colors to default. Again, select #70889F as foreground color and draw a rectangle with the help of Rectangle tool.
Select this layer by control+clicking on its name in layer pallate. Change the foreground color to #8095AA. Use foreground to transperent gradient to fill the selection as shown in the picture.
Add some text and custom shapes. Our simple header is ready.