I covered the front of the paper with photos and a 3x4 block, keeping things clumped in the center of my page. I was sure to not add adhesive behind where the flap of my envelope would tuck under when closed. We received an invitation to the event, a certificate for the program and a letter from his Kindergarten teacher that was even read out loud that night. Some pretty spectacular things to save.
Cascading flowers around the center clump filled some of the white space and gave your eyes a place to wander around. I really enjoy creating pockets and hidden journalling on my pages.
Hope you will give it a try.