I can’t really think of one…although I do think that I don’t really have that good of a use for those little spikes on the Ben 10 figures.
(excluding broken pieces)
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Those huge semi-trans Vahki head wraps.
And those Toothbrush Mask attachment things are hrad to use.
~W12~
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Which one?
Either way, I wish these came in more colours and were in more sets; they aren’t as thorny-looking as the traditional spike pieces that current sets have and would provide more options for detailing
Speaking of Ben 10, I would like to see someone use this effectively 
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…is that supposed to be a spaceship?
Yeah, it’s a really awkward piece. But most of the other launchers can’t be used as much other then launchers either…
MOC by JANGBRiCKS
What pieces exactly?
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Well, I didn’t say they were impossible to use. Just that they’re hard to use.
~W12~
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I dunno if those would technically count. They’re probably not made out of ABS plastic in an official LEGO factory.
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Those little rubber-band holder pieces that came with the Visorak and other BIONICLE sets.
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it seems I hold the displeasure of owning him…
At least you got Vapour; he’s pretty cool.
Bohrok bodies are too weirdly shaped, textured, and clunky to be used nicely
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honestly, I haven’t used a single Vapor specific piece either… worst exclusive set evar should have gotten Rotor instead
on a side note, I’m making a list of all these to see how many I can actually use In a single MOC
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Yeah, that one’s supposed to be a more alien one in design, I made another that looked less geary, and more like something humans would build, but I took that apart because I needed the Roborider head for a MOC contest.
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I can think of one instance this is used in:
http://djokson.deviantart.com/art/The-Muldwarg-584752468
He makes awesome creations, and he uses parts in very unusual way.
Rahiden made a spaceship, only using 6 or 7 pieces, one of these is the aforementioned squid launcher. 
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I feel like if I post a piece someone out there made something to prove me wrong. 
Hmmmm, I think the most useless part would be stuff from Galidor.
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The Vakhi piece the head attaches to, that then attaches to the Rahkskii piece. I know it can be used for stuff, but it’s quite difficult.
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I have him as well and I can concur with you
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Probably this…believe it was used with the Bohrok (Maybe the Rahkshi also, not sure) had so many ideas for it originally yet it can only really connect with a few pieces and it can only be hung from the interior of a canister. I suppose if you are good with pieces you could probably use it as a peg-leg or a spine piece, but cant think of much you can do with it.
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They make nice wings.
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