Round here the usual thing is to grow your toms and once they are cleared bring in your winter Chrysanth plants to flower until February. By that time you'll be needing it again for propagation of plants so this should give you 365 days usage. Christmas potatoes are becoming popular as well.
I've always struggled growing Toscana De Nero kale (which I love!) so this year I'm going to grow it in the greenhouse.
If you think about it, any crop that you would normally grow through the winter outside can be grown in the greenhouse inside, to give stronger, earlier plants which won't suffer from winter gales.
Possibilities are kales, spring cabbage,savoys,psb(though you'll need a lot of room for this one) winter radish,lettuce,Japanese onions,leeks etc etc etc need I go on?
The permutations are endless but you'll need to put a bit of thought into it and be spot on with your planning by having plants ready at the right stage of growth!

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My Majesty made for him a garden anew in order
to present to him vegetables and all beautiful flowers.- Offerings of Thutmose III to Amon-Ra (1500 BCE)