I have been told (on SO many occasions)..."I can't believe you live on your budget!" :)
First, I don't make any of my own household supplies. To me, I can't imagine that would actually save much money, and I am too attached to the sense of being clean, smelling good, etc, to even go there. Maybe I'm biased, because I tend to save a ton of money on just about everything.
As far as coupons go, never clip one that's for something you wouldn't normally buy...that's actually costing you money. However, I scour the papers we get (free editions) to find coupons on products I'm already going to purchase, and that's a big help. There are some things I will buy generic...diapers, wipes, toilet paper, paper towels, paper plates, plastic baggies, trash bags, etc...basically, if I'm going to THROW IT AWAY, why do I need to buy a more expensive version? :) These generics work fine, and save me a LOT of money. I also don't use paper products unless necessary (I mean, we ALL need toilet paper...hee hee)...but to clean, I use rags that I wash and reuse, to wipe up spills, etc, I use towels, we use linen napkins, etc...
I also agree with TF that I don't drive around looking for deals. I shop at Target, which has the overall best prices in my area (yes, better than WalMart), and I go once a month to stock up on my household items. I NEVER buy these at a grocery store, because the price difference is astonishing. I plan ahead so I don't run out and have to make an extra trip out...with the cost of gas, each extra trip out is costing a chunk of change.
I think I save the most money on my grocery bill. We eat whole foods, mostly, fresh fruits and veggies, etc...AND we have one child that has CD and lactose intolerance and buy her lots of specialty GF and LF foods, and I still come in under a budget each month that I've heard people say they can't believe.
Again, I don't clip coupons I'm not going to use, I do a lot of shopping at Aldi's, we make our own chilis, soups, and other things you would normally buy in a can (with dry beans, etc)...in large batches, and freeze into portion containers, so we are always stocked up on these things but for way less money. I also make my own "cream of" soups at a cost of about a dime a "can" and they are far more healthy and tasty than Campbell's. I buy what's in season to save money on fresh food, I always look for sales on the foods I buy, etc...I'm sorry I don't have any more specific hints, but I think a lot of it is just common sense.
I quit drinking pop, and that saves me 16 dollars a month. We quit eating packaged cookies, and that saves another 8 dollars a month. We started drinking generic coffee instead of Folgers, and that saves me at least 10 dollars a months. All together, on those three small changes, that's 34 dollars. And I have made SO many changes like that, in order to accommodate my family's diets, needs, and our wants...we probably come in several hundred dollars less a month just on food than the "average" American family our size.