Like kathrynd, I don't do most of my weirder things to save money.
In terms of what people might find objectionable:
I use our pee in the garden. It's great fertilizer. (No really!)
I'm building a composting toilet, just because I want to learn about composting toilets
I spend a goodly amount of time around poultry poop, and let me kids play in the chicken coop if they want. Hasn't hurt 'em yet.
I rarely wash my hair with anything more than water, and I cut my own hair. I take "low maintenance" to the extreme with stuff like hair and makeup. (On the other hand, the idea of going more than about a week without changing my sheets skeeves me out.)
I brush my teeth with baking soda or my homemade tooth powder. Commercial toothpaste is weird.
We cloth diapered, so more poop related stuff there, but that stage is over, now.
I'm planning on raising maggots deliberately as a high-protein feed source for my hens.
I'll bury all kinds of stuff in the backyard. Those 30 pounds of free halibut bones took a few days to stop stinking, I tell you what.
I save old eggshells, bake them after something else comes out of the oven and then feed them back to the birds or use them in the garden.
But I don't do any of that to save money. If it happens to save money, great!
Your post made me think of more :)
I read online, a while ago, about the maggot raising for protein for chickens...it was very interesting.
When we house sit, (like now) many times we look after chickens..and we just throw out the egg shells (crushed, but not baked).This property is about 10 acres, so they have lots of bugs to catch on their own.
We house sat at a place that was off grid..and they had a composting toilet..I loved it. There is no odor, because there is a little fan (solar powered) that whisks aways odors. Every so often you drop down a handful of sawdust.
In Australia I never wear makeup..but in Canada, I do wear a minimal amount (I know..go figure)
I cut my hair once a year (let my daughter or husband do it) and my husband colors my hair (he asked to)
I wear my hair in a french braid , because I like it.
We no longer have any pets when we return home (Canada) for the summer, but we are foster parents for the SPCA to momma cats and her kittens, along with orphan kittens until they are old enough to go up for adoption. The SPCA supply all the litter and food...and we supply the love (the best job ever ! )
When my kids were small we did cloth diaper (with the pins/plastic pants)
Hung clothes in the heated basement in the winter, and outside to dry in the summer.
We cut open toothpaste containers (and a lot of other products) to use all of it.
Right now I have a plastic squeeze mayonnaise bottle cut in half..to get the stuff that refuses to come out