Problem: Kid needs to clean his room, but doesn't exactly know how/what/when/where. Enter the Imaginauts, with an episode all about design!
Lessons: The Principles of Design
Proportion (including Golden Ratio/Mean)
The worlds in this episode could be organized around a Jason and the Argonauts/Harry Potter and the Chamber of Secrets-esque adventure around the Imagination. Island hopping? Overcoming challenges/puzzles? Mazes?