Household
The theme in household applications for banana peels is polishing. After removing the stringy bits from the peel, rub away and watch the shine.
Shoe Polish
Rub the banana peel on your (leather) shoes, then buff them up with a soft cloth.
Leather Polish
Leather jackets and furniture could benefit from those peels. Please test a small area first before tackling your sofa with a banana peel and buffing it with a soft cloth.
Silver Polish
The application is the same as above: rub and buff.