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/usr/share/xscreensaver/config/rubikblocks.xml is in xscreensaver-gl-extra 5.30-1+deb8u2.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="rubikblocks" _label="RubikBlocks" gl="yes">

  <command arg="-root"/>

  <hgroup>
   <vgroup>

    <number id="speed" type="slider" arg="-delay %"
      _label="Frame rate" _low-label="Low" _high-label="High"
      low="0" high="100000" default="20000" convert="invert"/>

    <number id="cubesize" type="slider" arg="-cubesize %"
      _label="Cube size" _low-label="Small" _high-label="Large"
      low="0.4" high="2.0" default="1.0"/>  

    <number id="rotspeed" type="slider" arg="-rotspeed %"
      _label="Rotation" _low-label="Slow" _high-label="Fast"
      low="1.0" high="10.0" default="3.0"/>

    <select id="start">
     <option id="cube"    _label="Start as cube"/>
     <option id="shuffle" _label="Start as random shape" arg-set="-randomize"/>
    </select>

   </vgroup>
   <vgroup>

    <number id="spinspeed" type="slider" arg="-spinspeed %"
      _label="Spin" _low-label="Slow" _high-label="Fast"
      low="0.01" high="4.0" default="0.1"/>

    <number id="wanderspeed" type="slider" arg="-wanderspeed %"
      _label="Wander" _low-label="Slow" _high-label="Fast"
      low="0.001" high="0.1" default="0.005"/>

    <number id="wait" type="slider" arg="-wait %"
      _label="Linger" _low-label="Short" _high-label="Long"
      low="10.0" high="100.0" default="40.0"/>

    <hgroup>
     <boolean id="spin"    _label="Spin"     arg-unset="-no-spin"/>
     <boolean id="wander"  _label="Wander"   arg-unset="-no-wander"/>
     <boolean id="tex"     _label="Outlines" arg-unset="-no-texture"/>
    </hgroup>
    <hgroup>
     <boolean id="wire"    _label="Wireframe"      arg-set="-wireframe"/>
     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
    </hgroup>

   </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
The "Rubik's Mirror Blocks" puzzle.
See also the "Rubik", "Cube21", and "GLSnake" screen savers.

http://en.wikipedia.org/wiki/Combination_puzzles#Irregular_cuboids

Written by Vasek Potocek; 2009.
  </_description>
</screensaver>