Using zucchini (courgettes) instead of cucumber for pickles
Zucchini (aka courgettes) can be used interchangeably usually for cucumber in sliced pickles such as bread and butter, sweet mix, etc.
This is a good tip to keep in mind if you are making pickles at a time of the year when cucumbers are very expensive and zucchini are not.
There are also many pickle and relish recipes for other summer squash.
Here are recipes and information on healthycanning.com for canning zucchini / courgettes.