I discovered the ngon plugin recently, and really like the fun shapes it can generate, especially when ngon_sides is negative. I combined it here with spirograph, using the strict rules required for Apophysis Challenge #160, for which this is my entry.

Tools and Resources
Apophysis 2.09 - flame generation and rendering
  Transforms: ngon by Joel Faber and spirograph by Lu-Kout
  Gradient: 10 from BD's Pastels (rotated)
Postprocessing - Adobe Photoshop Elements 9
  Black background
  Duplicate layer to intensify colors
  Resize to web size using Bicubic Sharper

Parameters
<flame name="121207-2" version="Apophysis 2.09" size="1000 1000" center="0.19 0" scale="200" oversample="1" filter="0.5" quality="50" background="0 0 0" brightness="5" gamma="4" gamma_threshold="0.25" >
<xform weight="0.5" color="0" symmetry="0.841" ngon="1" coefs="0.789178 0.315424 -0.315425 0.789182 0 -0.008571" ngon_sides="-5" ngon_power="1.885" ngon_circle="1.5" ngon_corners="1.15" chaos="15 " />
<xform weight="0.5" color="1" ngon="1" Spirograph="2" coefs="0.011437 0.685664 -0.685664 0.011437 0.016964 -0.004285" ngon_sides="3" ngon_power="0" ngon_circle="1" ngon_corners="5" Spirograph_a="1" Spirograph_b="5" Spirograph_c1="1" Spirograph_c2="5" Spirograph_d="0" Spirograph_tmin="0" Spirograph_tmax="25" Spirograph_ymin="0" Spirograph_ymax="0" chaos="1 1.25 " />
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</flame>