Whatever type or kind of collage' a person wanted to make can be sealed permanently with two-part epoxy poured over the surface. Ya know, like those log slices with pics on em. Some of them are made into clocks. So, one idea would be to arrange all your favorite pics of the grow in a pleasing arrangement, with a few leaves thrown on for authenticity, onto a piece of wood. Then mix up a quart of epoxy resin with a quart of epoxy hardener, and just slowly pour it over your newly created artwork.

Just in case your not familiar with it, you can find GOOD epoxy at any good woodworking supply place whether it be a brick and mortar store, or online.