I have been able to get some of those straight angle things out of the kpk.ucl (KPK Squeezed Banana....set the 'squeeze angle' = 90). Possibly some of the other KPK ucls have some similar things. Also, if the fractal or ucl options has 'ceiling', 'floor', 'trunc' or 'round' at the end of a function option list, those settings tend to cut off the colorings at straight/right angle lines. Try, if you are using multiple layers, to use the difference settings between layers to get some effects.

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."