|1||USB Vcc (Vbus)||usually RED, wire should be 20-28 AWG||1|
|2||USB Data -||usually WHITE, wire should be 28 AWG||2|
|3||USB Data +||usually GREEN, wire should be 28 AWG||3|
|4||GND||usually BLACK, wire should be 20-28 AWG||4|
USB D+ and D- are twisted in cable. Outer shell is made of copper braid and aluminum shield.
Colors do not mean anything in the wiring scheme. You can use any color wire to rig something. Just make sure the colors match from end to end. Using the de-facto color is for industry types only.