For some spells , you do not need any items . The items listed are sometimes are just there to provide the Atmosphere and provide a visual aid .so by just reading it out , you probrably sent forth some energy along those lines and thus it manifested . Again , it could also be a coincidence
As for callin ghost with a paper , you may also unconsciously be inviting or summoning them with the paper as a tool , and when you know you can do it , you can consciously call them whenever you want with the paper as your materials.
You can use any kind of magick. You just need to learn how to do magick and you know how to do them all . You can use them all once you know how to use magick in general . I do not see why you need to restrict yourself to one path .
Also , magick has no color , it is just to symbolize intent of your workings