Harking back to the original inspiration for the whole of Recycle This (pistachio nut shells), I’ve been wondering about olive stones recently.

Olive pits aren’t as big or pretty as other fruit stones but my, we “generate” a lot of them. Given we live in the windswept north of England, we’re probably not going to have a lot of success growing them into trees – and even if we did, if we try to sprout them from every stone we de-fleshed, we’d be quickly overrun!

So what else can we do with them? As with pistachio nut shells, it seems a waste to just compost them.

Googling around, I’ve seen some suggestions of using them for fuel – anyone know anything about that? Do any companies that pit them pre-sale do anything like that?

I also have half of memory of being able to grind them up and use them in homemade exfoliators like ground walnut shells – I don’t know how hard they are to grind up though…

Any other ideas?

We’ve had an email from Jenny asking:

I have some old perfume bottles, they are so pretty they shouldn’t just be thrown in the normal glass recycling.

Is there anything I can do with them, other that just display as an ornament. I don’t want to do this, as I hate clutter. Any ideas?

For starters, some of what to do with old Tabasco sauce bottle ideas might apply here too – since both are small, pretty glass bottles with a tiny-teeny neck.

For sprays, I also like DJ’s idea on the pump action spray bottle page – fill the bottle with water to use as a cooling spray mist on hot days.

Taking that a step further, you could refill the bottles by making your own scented body or room sprays using essential oils – if that’s not your sort of thing, you could maybe offer the empty, clean bottles on Freecycle to someone in your area who would like to do that.

What else can you do with empty perfume bottles? Do you have any special ways to reuse them?

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We’ve had a rather specific question from Douglas but we sometimes get incredibly informative responses to these type of questions so I thought it was worth posting in case anyone knows anything:

I was wondering if you knew of a way that I could reuse blocks that have been milled using a CNC machine (as known as rapid prototyping) The block are made out of zirconia and are use for the 3M Lava milling center. I hope you can help although i understand if not as this is and incredibly odd request since it is so specific.

So … anyone? I’ve not been able to find anything particularly useful on Google and I’ve sent a message to 3M about it but not heard anything back yet. Anyone else in a similar position?

We’ve had an email from Sue:

I’d be grateful if you could help me. I am trying to find somewhere to take an old motorbike helmet for recycling – I have googled but the only useful suggestion I could find was to take it to an old ambulance station for them to use to practice taking off dummies! I live in London but am willing to post it somewhere to be put to good use.

I’m presuming the helmet is damaged in some way that it wouldn’t be safe for use on a motorbike any more – if it is ok, just no longer wanted, it could go on Freecycle/eBay for re-use for its intended purpose. UPDATE: Ok, turns out they shouldn’t really be used secondhand (see comments).

What if it is damaged/potentially compromised though? I love the ambulance station idea or using it as an educational aid in other ways – anyone know of any initiatives/organisations that could use it?

Are there any creative reuses for them? I wonder if they could be turned into themed furniture/houseware for a motorbike fan – I have half a memory of seeing one turned into a lamp but can’t find anything about that now. The only thing I can find is a link to an artist who builds on them to make scary alien/fantasy creature heads – which isn’t the same things at all ;)

We’ve had a “Can I Compost This?” email from Wynn:

Can I compost fish heads?

The answer to this, like meat & animal products, is usually no. Unless you have a sealed composting system or the like, the odour of the fish might attracted unwanted vermin to your compost heap and unless your composting area is really far away from your house, it might get a bit stinky for you too.

But like other animal bones, you can though use fish heads and skeletons to make fish stock. There is often quite a bit of meat on the heads of bigger fish like salmon, so don’t forget to save that: it can be used anywhere you’d use mashed up fish (salads, fish cakes, seafood risotto…) or in the stock to make a hearty soup. Like all stocks, it will freeze well if you’re not going to be able to use it straight away and if nothing else and you’ve got cats, the stock will make you a firm favourite with your felines.

Any other suggestions of things to do with leftover fish bits?

(Photo by mama)