What you will need:
Potassium Nitrate
Any Color of Organic Powdered Dye
Sugar
Baking Soda

Instructrions
First, put 60g Potassium Nitrate and 40g Sugar in a pot. Put on the stove and set to a Low Tempature. Keep stirring until it looks like Peanut Butter. Add a spoon of Baking Soda and stir some more. Then add the Organic Dye and mix until it is fairly smooth. Now your done with the mix. Now to get started on the Bomb.
Fill a card tube with mix. Then stick a pen in the middle. Leave it to dry for 1 hour. After that, remove the pen and insert the fuse which you can get from a firework. And secure with cotton wool. Wrap with duct tape and leave a hole at the top. Your done!
Light and RUN!!!