Open a new file with 1024×852 px and 72 dpi. Using the following tool

picture the background which colors’ codes are shown below.

Apply another tool now

and represent a rectangle with the parameters from below.

Blending Options-Gradient Overlay

Gradient’s parameters.

Using the next instrument

draw the next figure colored in 4ECF24. The sizes are the next ones. Use now the next tool

to delete the lowest part of the picture.

Blending Options-Gradient Overlay

Gradient’s parameters.

Take again the next tool

and insert the next element of our picture with the sizes from next image. After that, apply

to delete the top part of our picture.

Blending Options-Inner Shadow

Hide exactly this layer now.
Blending Options-Gradient Overlay

Gradient’s parameters.

Using the following tool

, represent another element colored in 005782 with the shown sizes next step.

Blending Options-Gradient Overlay

Gradient’s parameters.

Show again the hidden layer before and place correctly the layers also.

Take again the indicated instrument

and represent the figure from below. You are finishing the header. 

Fill 0% on the layers. The Opacity must be about 20%.
Blending Options-Gradient Overlay

Gradient’s parameters.

Use the same instrument

and insert a new figure(button for Menu) colored in 289FCE

Take now

for adding the next element (area for Left Menu) of our picture with the sizes demonstrated next step. Then use again

to erase the lowest part of the image.

Blending Options-Gradient Overlay

Gradient’s parameters.

Take a different tool now

to draw a triangle colored in C3C3C3.

Make use of this instrument now

and build six stripes for Left Menu with the color C3C3C3.

Using the following instrument

represent a triangle colored in 888888.

Copy the new made layer 5 times and make them look exactly like it is shown below.

Applying the next tool

build a line colored in black.

Add now the text for your Blog’s Title, keeping the same type, size and the color, demonstrated in the next table.

Blending Options-Drop Shadow

Add the next part of the text (your slogan), but keep the same demands shown next table.

Blending Options-Drop Shadow

Add again the text for Left Menu, but be carefully with the type, size and the color.

More text now (first post on your blog). The demands for the text are indicated below.

And now, you should introduce the rest of the text for Horisontal Menu with the same type, size and color, shown next step.

That’s it!