Paint brushes. Uses: to add designs. Each brush gives a different stroke for different designs. Where to buy: any hobby store, local Walmart, or Sally's beauty store.
Stripers Uses: to add a straight line. Stripes, and many different designs. Where to buy: a local Sally's beauty store, online (eBay, Amazon.com) Walmart even sells kiss polishes with a Striper.
Toothpicks Uses: to fill in designs, and to add dots to designs. Also used to pick up rhinestones when the tip is dipped in clear polish, or water. Where to buy: Walmart or Sally's for larger one.
Dotting tools Uses: basically used like a toothpick but with better results. Also different sizes available. Where to buy: online, Sally's beauty store.
These are the tools that I use to add designs and effects to my designs. Please post questions about any other tools I may have forgotten. Enjoy!