Backstory: We have heated blankets and car seats... how about a heated couch?!
The Idea: A heated couch.
Deep Dive: Similar to how a heated seat is created, you would build electric coils into the padding of the couch. You could take this a step further and integrate with Alexa/smart home devices, that way the couch can be warm whenever your customers configure it.
Validation: Heated car seats. You could hack together a heated blanket into a couch and see if the heat radiates enough to get some customer feedback.
Monetization: A straight ecommerce play, watch your margins!