Here's 2 from mandelbrot(abs z, p.x)^2 + zlast abs p.y (a variation of Phoenix) created with (Click to view the full image)

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Here's a weird formula
z^2 sin (re z) + c z cos(im z) + c
You have to play around with it a little bit. Here are two pieces I just did in for Android (Click to view the full image)

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Here's a couple of from
(z^c + 1)cos(z - 0.5)(z^2 -1) + c
Created with for Android
Click to see the full version.

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