I like the way stamps look and think you could make some really cool projects with them. The problems is getting enough and not paying 41 cents for each. Arpin Philately to the rescue. They sell bulk stamps or stamp packets. You can get 100 (all different) train stamps for $4.50.
If you were doing a train theme in a nursery you could cover inexpensive picture frames with train stamps or a wooden light base.
Or you can get 200 (all different) Denmark stamps for $20.
I am going to order some and try out some ideas. The list of stamps is huge and there are so many things you can do with them. They add a bit of color and are definelty interesting to look at. Also if you child is doing a school project on a country wouldn't it be neat to get some stamps from that country to add to the presentation.