This page calls for one 4x6 and three 6x4 photos
This is Imagine Balanced Rhythm (pg 84). The photo suggestions are: five 2.5x5 (or one 5x7 like the one of Leo I cut into the smaller pieces and then two 2.5x5) photos, two 5.5x5, and two 2.5x2.5 photos.
This is Imagine Rhapsody (pg 81). The photo suggestions are: five 5.5x3, one 7x5, two 3x3 and one 5x7. These pictures are 5 years old and I didn't have the sizes the layout called for so I totally improvised and made the pictures I had work. If you want to see what it's "supposed" to look like, click here.