The ones DH got me were from Sears.
Here is a pic:
They can be hung on the wall or stood on a table. The outside is wood in either walnut or black finish. They have a magnetic closure and come with black headed straight pins for securing items to the inside. The back is made of styrofoam covered in cloth. The cloth is nice, because if you decide to move something it doesn't show the hole from where you initially placed the item.
They cost ~$30.
Click Here to go to the Sears page for their description and purchase info.
Maybe I'll actually get a pic of my finished one on here to show you sometime soon. But, don't hold your breath. LOL
ETA: I guess I could at least descibe it for you. I put an 8x10 pic that was taken of DH and me at the luau we went to on Maui in the back ground. Then I attached a dried bamboo orchid that I had worn in my hair in the upper left corner. I hung a shell lei dangling across the front. And, in the bottom I put some sand that we brought back with us and an oyster shell and pearl that I got there. (It was one of those jewelry places where you pick your oyster and they open it in front of you. My oyster had 2 pearls. I only wanted one for a necklace. So, I kept the other and the oyster shell to use for the memory box.)