The documents, reported by Ecuadorian journalist Fernando Villavicencio, revealed the various ways in which officials thought about trying to help Assange escape from the embassy without being arrested by British police officers.
Among the bizarre proposals were suggestions that the Australian leave the building disguised in fancy dress, or that he leave the embassy in the hope of becoming lost in the crowds of people at the nearby retail store Harrods.
"Assange could leave in fancy dress or try a discreet exit," one document said.
Even more daring was a suggestion that Assange could reach a nearby helipad by escaping through the embassy's roof.
"He can try to reach a nearby helipad across the rooftops, or he could get lost among the people in Harrods."
British authorities have guarded the embassy to ensure that police will arrest the WikiLeaks founder and subsequently send him to Sweden for questioning over sexual assault and rape allegations, if he tries to leave the building.
The 44-year-old has denied the allegations, amid fears that any attempt to travel to Sweden will result in him being extradited to the US, where he is under investigation for potential breaches of the Espionage Act.
It's thought the cost of guarding the embassy to prevent Assange leaving stands at $17 million (£11 million).
Assange has been holed up in the embassy since June 2012, when he applied for, and was granted, political asylum in Ecuador.