We try to do all the usual things that the others mentioned: saving power and cleaning chemicals, reuse and recycle as much as possible.
For the laundry I use balls and only half the dose of soap.
Like Karen, our city also collects garden waste for composting, but we don't have access to it.
We choose cars that are consuming less gas. We do not use the cars for small trajects, we walk (we like walking anyway!).
When we have the choice we try to buy stuff with the smallest amount of packaging around.
For vegetables and fruits, we try as much as possible to buy local products. No strawberries in winter! We are members of a group that buy vegetables to a local farmer. Once a week we get bio vegetables directly from the local farmer. They are always different and always in agreement with the season.