How to layout
I will teach you how to make a a cool layout from a simple blend. For this layout I'm going to use some Rihanna pics from here.
I am going to open a new 900x650 file and fill it with #000000.
We going to choose few pics from that Rihanna site and blend them. For make them look better I changed the pic on the right to lighten and then delete few parts of it.

I added another pic and set it to lighten again and with the select tool deleted few parts, remember to change the hardness for the erased part looks less plain.

Continue adding few pics and change the settings to lighten or soft light depending how you want the results.

Now let's delete few parts that look bad with the erase tool or the select tool.For exmaple I have to delete this part:

Now the blend is made we are going to use some effects. I added this texture from Swimchick.
And I set it to overlay. I deleted few parts that look really hard and duplicate it in some parts.

After adding the texture we will add few brushes.Here you can download them.

And for end it we will add some texture as background and a black border and you will have something like this.