Random.value

Description

Возвращает случайное число между 0.0 [вкл] и 1.0 [вкл] (Read Only).

Both 0.0 and 1.0 may be returned by this property. This behaviour is different to that of many other random number generators which return a value less than but never exactly equal to 1.0.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    Color RandomColor() {
        return new Color(Random.value, Random.value, Random.value);
    }
}