Don't worry if you see an airplane that looks unrecognizable, especially at night. Airplanes often look strange from odd angles, and it takes lots of experience to recognize them from below and in poor visibility conditions.
All airplanes, including bombers, have a steady red light at the left wing tip and a steady green light at the right wingtip. The green light looks blue to some people. There is also a steady white light at the tip of the tail, visible from behind the airplane. These lights are carried over from nautical practice several hundred years old.
In addition, most airplanes have at least one red rotating beacon, and many airliners have one on top and one on the bottom. Furthermore, many airplanes have bright strobe flashers that flash like a camera flash. These are most often mounted next to the red, green, and white navigation lights at the tips of the wings and tail.
Other lights include landing and taxi lights, which are bright spotlights that shine forward. On airliners these are turned on whenever the airplane is below 10,000 feet. Airliners may also have "logo lights" or "company lights" that shine up on the vertical tail fin to illuminate the company insignia on the tail. These are usually turned off shortly after takeoff.
Finally, there may be "ice lights" that shine out along the leading edges of the wings to make ice on the wings more visible. These are turned on when needed.