For each design I started out by arranging the images how I want them, leaving space to add a title and text.

Design 1:

Design 2:

Design 3:

For designs 2 & 3 I used the same layout but changed the images around.

Design 4:

For this design I used one of my images as the background. I did this by inserting an image and then changing the opacity.

Design 5:

I experimented with this layout as used the gradient tool to create the background.