Hi,
I was just thinking of some of the small habits i've gotten into from habit and though i'd share...
I know some of them have probably been mentioned before 
Always break a dishwasher tab in half
Water down fabric conditioner to get 2 bottles instead of 1
Freeze unwanted bananas for cakes
Chop up apple cores for the birds
Save pumkin seeds for planting
Save envelopes for seeds from old calendars
Use old envelopes for shopping lists if not reused
This one is stingy [embarrassed]...intead of buying a calendar, I just print off monthly from on-line planner. It gets amended anyhow and easier just to put on pinboard
Save old flyers to make paper chains.
Add handful of porridge oats to make crumble go further