Use blankets and couch cushions to create an indoor fort.
Have Story time and read to your toddler.
Let them help clean the house. They can push a broom around and help you clean the house.
Give them a rag with some soap and have them wipe down surfaces they can reach.
Some toddlers really do enjoy cleaning and it teaches them a good life skill to have.
Go ahead and bundle them up and go on outside for at least 15 or 20 minutes to burn off some energy.