Binary Star* System: In free space, make a stationary L-planet, and another one near by, moving in a direction not directly towards or away from the first planet. Congratulations**! You now have two L-planets orbiting each other!
*Stars may be L-planets. **There is a chance that the two planets may have collided. If so, do not fret, and try again.
Supermassive Asteroid: Set SPEED=0, then spam S-planets on the same pixel. S-planets do not destroy each other, and if done correctly, all will have the same position and velocity, so you will end up with a massive S-planet.