Amatuer Smoke Bombs and Rocket Engines

I've always thought the smoke bombs that magicians (and supposedly ninjas) use would be fun to make. Here is a website that explains (both video and written instructions) how to make smoke bombs using potassium nitrate and sugar. (A different article here).

Apparently the same materials can be used to make model rocket engines as well, which is nice to know because I like shooting model rockets, but the price of engines has skyrocketed (pun intended) over the last several years. (Another recipe for rocket fuel; and this page appears to offer significantly detailed information).

Apparently you can also make fuses.