Use less code. Leave room for deeper levels.

autoload/rainbow_parentheses.vim

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+"==============================================================================
+"  Description: Rainbow colors for parentheses, based on rainbow_parenthsis.vim
+"               by Martin Krischik and others.
+"               2011-10-12: Use less code.  Leave room for deeper levels.
+"==============================================================================
+
+let s:max = 16
+
+func! rainbow_parentheses#activate()
+	hi default level1c   ctermfg=brown        guifg=OrangeRed1
+	hi default level2c   ctermfg=Darkblue     guifg=LightGoldenRod1
+	hi default level3c   ctermfg=darkgray     guifg=DeepSkyBlue1
+	hi default level4c   ctermfg=darkgreen    guifg=HotPink1
+	hi default level5c   ctermfg=darkcyan     guifg=chartreuse1
+	hi default level6c   ctermfg=darkred      guifg=OrangeRed1
+	hi default level7c   ctermfg=darkmagenta  guifg=LightGoldenRod1
+	hi default level8c   ctermfg=brown        guifg=DeepSkyBlue1
+	hi default level9c   ctermfg=gray         guifg=HotPink1
+	hi default level10c  ctermfg=black        guifg=chartreuse1
+	hi default level11c  ctermfg=darkmagenta  guifg=OrangeRed1
+	hi default level12c  ctermfg=Darkblue     guifg=LightGoldenRod1
+	hi default level13c  ctermfg=darkgreen    guifg=DeepSkyBlue1
+	hi default level14c  ctermfg=darkcyan     guifg=HotPink1
+	hi default level15c  ctermfg=darkred      guifg=chartreuse1
+	hi default level16c  ctermfg=red          guifg=Yellow
+	let s:active = 1
+endfunc
+
+func! rainbow_parentheses#clear()
+	for each in range(s:max)
+		exe 'hi clear level'.each.'c'
+	endfor
+	let s:active = 0
+endfunc
+
+func! rainbow_parentheses#toggle()
+	if !exists('s:active')
+		cal rainbow_parentheses#load('(',')')
+	endif
+	if s:active != 0
+		cal rainbow_parentheses#clear()
+	else
+		cal rainbow_parentheses#activate()
+	endif
+endfunc
+
+func! s:cluster()
+	let levels = ''
+	for each in range(1, s:max)
+		let levels .= ',level'.each
+	endfor
+	exe 'syn cluster rainbow_parentheses contains=@TOP'.levels.',NoInParens'
+endfunc
+cal s:cluster()
+
+func! rainbow_parentheses#load(br1, br2)
+	let [level, grp, alllvls] = ['', '', []]
+	let [br1, br2] = [escape(a:br1, '['), escape(a:br2, ']')]
+	for each in range(1, s:max)
+		cal add(alllvls, 'level'.each)
+	endfor
+	for each in range(1, s:max)
+		let cmd = 'syn region %s matchgroup=%s start=/%s/ end=/%s/ contains=TOP,%s,NoInParens'
+		exe printf(cmd, 'level'.each, 'level'.each.'c', br1, br2, join(alllvls, ','))
+		cal remove(alllvls, 0)
+	endfor
+	let s:active = 0
+endfunc
+
+" vim:ts=2:sw=2:sts=2

plugin/rainbow_parentheses.vim

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+"==============================================================================
+"  Description: Rainbow colors for parentheses, based on rainbow_parenthsis.vim
+"               by Martin Krischik and others.
+"               2011-10-12: Use less code.  Leave room for deeper levels.
+"==============================================================================
+
+com! RainbowParenthesesToggle       cal rainbow_parentheses#toggle()
+com! RainbowParenthesesLoadSquare   cal rainbow_parentheses#load('[',']')
+com! RainbowParenthesesLoadRound    cal rainbow_parentheses#load('(',')')
+com! RainbowParenthesesLoadBraces   cal rainbow_parentheses#load('{','}')
+com! RainbowParenthesesLoadChevrons cal rainbow_parentheses#load('<','>')