Modified lines in preferences.txt (file location seen in program preferences window), and /Applications/Arduino.app/Contents/Resources/Java/lib/theme/theme.txt

preferences.txt

editor.font=Bitstream Vera Sans Mono,plain,12
editor.antialias=true

theme.txt

# EDITOR - DETAILS

# foreground and background colors
editor.fgcolor = #F8F8F8
editor.bgcolor = #141414

# highlight for the current line
editor.linehighlight.color=#202020
# highlight for the current line
editor.linehighlight=true

# caret blinking and caret color
editor.caret.color = #A7A7A7

# color to be used for background when 'external editor' enabled
editor.external.bgcolor = #c8d2dc

# selection color
editor.selection.color = #303030

# area that's not in use by the text (replaced with tildes)
editor.invalid.style = #7e7e7e,bold

# little pooties at the end of lines that show where they finish
editor.eolmarkers = false
editor.eolmarkers.color = #999999

# bracket/brace highlighting
editor.brackethighlight = true
editor.brackethighlight.color = #006699