The best replacement for cube is soul.

The best alternatives to cube are rated as following:
★★★★★  soul
★★★★  cypress hill
★★★  kia soul
★★★  rectangular prism
★★★  square
★★★  cuboid
★★  scion
★★  nano cube
★★  aquapod
★★  sphere
★★  rollup
★★  makerbot
★★  bio cube
★★  square prism
★  mack 10
★  5/3/1
★  common
★  nwa
★  scion xb
★  relational database
★  office
★  mike jones
★  xb
★  biocube
★  play station
★  death star
★  prism
★  data mart
★  star schema
★  cubicle
  ice t
  cone
  data warehouse
  direct reflecting
  play station 2
  sphere why
  tabular model
  kevin hart
  music bullet
  eazy e
  x box
  dice
  2pac
  vox da5
  cypress hill beef

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Speaking about cube, one probably shouldn't forget about cube.

Other search terms related to cube and their ratings are:
★★★★★ cube
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Google Trends

Scale is based on the average worldwide traffic of cube in all years. Click on graph for more.
cube
soul
cypress hill