This is a fun and easy project that takes very little money.  It does require some patience, but in the end you have a pretty cool and effective bow that you could use for target practice or light hunting.  I’m not going to get into the details of the build because there is an expert on the subject who has a website and youtube channel, The Backyard Bowyer. He also has a book available on Amazon. The best option is to go to his website,and from there you can access his videos as well as see all of the info he has available.  There are so many cool designs and with some creativity, you can make pretty much any style of bow you want.  I use paracord for my bow strings. With a little paint, they can be customized any way you want.   I am going to highlight a few of the ones I built and also videos of me shooting them.

5′ Longbow: 
   
Traditional Horsebow:  

Snakey Recurve: