Could you tell me how to make some homemade spy gadgets?

Spy gadgets can be a great fun especially you are a kid and the important thing is that they will cost you nothing. So you can enjoy in a rainy afternoon or in a birthday party complete with dark glasses and trench coats. The method is to make fingerprint powder for you spy gadget kit and this can be easily made by pouring cornstarch in stoneare saucer. You will have to take a second one and Scrape the soot into the cornstarch and stir it. You can also be a supercool spy by just making a periscope which you can use to look over fences and corners. For this, you will have to make a 2-inch square in one ( by cutting) end of your cardboard mailing tube with the help of knife. Make a 2 inch digonal slit at each corner of the square. Then mount mirros with glue and insert them into slits on your tube. Another one is Spy goggles and they can be easily made by just using a permanent maker to color your actual goggels. There are lot more ideas like inserting your digital camera or webcam in toy, using old cellphone as spy phone ect. I hope my suggesions will work for you. Thanks