“Fall Fun for Fast Finishers” is a free packet of 20 open-ended task cards from Rachel Lynette at Minds in Bloom. Her packet is available for free download from Teachers Pay Teachers. You do have to be a member in order to receive the download, but it is free to register.
I love one of the sample cards that Rachel displays in her blog post, which asks you to pretend you are Autumn (the season) and you are running for president against the other three seasons. What a creative idea!
On a side note, Teachers Pay Teachers can be a goldmine for lesson ideas. There are many, many free activities available. It is well worth registering.