Brush off your bicycle and use it for local trips...I have seat on back for dd
Make own packed lunches for work ...
Cook in bulk and freeze ...
Make ready supply of soup ...
Use lots of pulses in cooking to 'stretch' casseroles etc...
Buy clothes in one or two colours (probably v. boring but most of my winter clothes for eg are brown or based around brown which allows me to add to collection each year and use items for much longer - also buy less because everything (accessories and shoes) goes with everything )
Get water filter and drink tap water instead of bottled
Buy good quality children's clothes in huge sizes - dd has been wearing one of her coats for 3.5 yrs!!
Buy Christmas presents (particularly toys) wrapping paper and cards in January sales (wish I could follow my own advice on this one!!)
Use Voipbuster to make phone calls - better than skype because can use phone2phone facility - don't need to be rooted to computer screen, can use ordinary land line
Look after clothes well. Store them well. Will last longer.
Be organised with birthday and Christmas presents (again need to follow my own advice here) so you don't end up "guilt" buying something more expensive because it's late ... also, inexpensive thoughtful gift much more appreciated than expensive last-minute buy
Grow own fruit (blackcurrants v. easy for eg) and make your own jam to give as presents
Dispense with "luxury" cleaning items ie things that are not totally necessary such as fabric softener. Use household white vinegar to clean everything - v. good for rinsing hair too!!
Make your own cleaning products (loads of websites provide details)