ID on these natives please.

[Paulneill]

I know they aren’t your typical bonsai material but might be nice.

[Paulneill]

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[Paulneill]

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[Ryceman3]

I’ll have a bite with no real clue...
1. Hakea
2. Grevillea
3. Adenanthos

[Elmer]

Guessing first two pics are the same tree... Grevillea most likely 'Robyn Gordon'

I'd second ryceman with Adenanthos for the 3rd but the pic doesn't give much detail

[shibui]

That last one is Adenanthos - probably Adananthos sericeus AKA wooly bush. Native to South coast of WA. They respond quite well to growing in pots and tolerate pruning quite well so may be OK as bonsai. Like many WA species they can suffer from root problems if the soil is too wet.

The second one is definitely a grevillea but I would not hazard a guess on the variety because there are now so many varieties and hybrids that you need some real expertise to tell which is which.
Not enough detail in the first for a good ID. Probably a grevillea but also possibly a hakea. We would need flowers to be certain.
Some of the smaller grevilleas are being used successfully for bonsai. I have not had much success but Ruth from Canberra seems to have worked out how. I think there's some threads on Ausbonsai about her work.
These larger types with the larger leaves and typically 'toothbrush' flowers are generally from Northern Australia and many are marginal in my colder climate. The large toothed or compound leaves don't really lend themselves to nice neat bonsai. Try some of the grevilleas with smaller leaves for better looking results.
I have found grevillea extremely hard to transplant. Younger, smaller ones can sometimes survive transplant but I have never had a larger one survive.