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Here's a coffee-script answer running on node.js: In black and white:

m=(x,y)->
 a=x
 b=y
 z=0
 for i in [0..99]
  (return if i>60 then '*' else if i>10 then '-' else if i>5 then '.' else ' ') if z>4
  l=y*y
  z=x*x+l
  y=2*x*y+b
  x=x*x-l+a
 '@'
console.log (m x,y for x in [-1.5..0.5] by 2/79).join '' for y in [-1.3..1.3] by 2.6/40

Adding color:

n='\u001b[0m'
m=(x,y)->
 a=x
 b=y
 z=0
 for i in [0..999]
  (return if i>100 then '\u001b[33m*'+n else if i>10 then '\u001b[34m-'+n else if i>5 then '\u001b[31m.'+n else ' ') if z>4
  l=y*y
  z=x*x+l
  y=2*x*y+b
  x=x*x-l+a
 '\u001b[32m@\u001b[0m'
console.log (m x,y for x in [-1.5..0.5] by 2/79).join '' for y in [-1.3..1.3] by 2.6/40