Camp
You want to preserve the mementos from your children going to camp. Use a simple cardboard shoebox, or purchase a plastic shoebox. Cover the box with you or your child's favorite color of cloth. Cut the cloth as if you are wrapping a present.
Place the box in the middle of the square of cloth. Pull the sides up tightly, wrap the material over the edges of the box and glue the material to the inside of the box. Repeat the same process for the lid. Glue a length of colored elastic across the middle of the lid.
Attach an envelope to the inside of the lid to hold letters from your child. Place all the keepsakes that your child brought home from camp in the box.
Ocean Trip
Mementos from a trip to the ocean can be stored in memory boxes. Use a tackle box, and put seashells and rocks by size in each compartment. If you saved a plastic bag full of sand, transfer small amounts of sand into small jewelry bags and lay these in each compartment with a seashell on top of the bag.
Cover the outside of the tackle box with an ocean-themed material or paint the outside of the box to look like the beach, ocean and clouds.
Alternatively, wrap a wispy bathing suit cover-up around the tackle box.
Military and Wedding
Larger items are stored in old trunks. Refurbish an old trunk by painting it or recovering it. For example, paint the trunk to look like the United States flag.
Place all the mementos, clothing, pictures, actual flags and other items from a time when your husband or son/daughter was in the military. This is an excellent way to protect those items and to keep them all in one place.
Alternatively, repaint an old trunk in white and with your wedding colors. Place your wedding dress, napkins, cake toppers, photo albums and other keepsakes from your wedding in the trunk.
Considerations
There is a multitude of ideas for memory boxes. Simply think of what you want to preserve and how big a container you need, and decorate the outside to fit your personal taste.