Napkin Fold Album.

I have made this style before.

Also see Laura hers are great.

 You just fold any square of cardstock in half to make a triangle,

open back out. 

Measure how long your fold is and mark into 3rds.

i.e 9" centre crease line,

Mark 3" and 6".

Then fold the other two corners

1/3 of the way to centre to make a pocket.

Really easy and looks great too.

You can just see the points of the triangle at each end as I added tags into the pockets.