I used to have 7 colored styluses that came with the Animal Crossing Game Case from Club Nintendo, but I lost most of them. I also have a black one for my DS lite and a white one for my 3DS XL.
Plain Black. It's the one that came with my Blue XL.
For my older DS Lites I also have the default Styluses that they come with. Pink with my Coral Pink one, and Lime Green with my Limited Edition Lime Green one.