Does anyone know how to change the color scheme and/or bullets used in Beamer's table of contents (without changing the overall structure color or theme)? Unfortunately, the following doesn't work:

\setbeamertheme{enumerate item}[default]
\setbeamercolor{enumerate item}{black}


I would even be fine removing the numbering altogether.

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The numbering in the TOC depends on the theme: the default theme doesn't use bullets, "Berlin" uses square bullets, "Madrid" circle bullets. Please tell us at least your theme or post a minimal example. –  Stefan Kottwitz Dec 30 '10 at 23:03
I've written a custom theme that's based on PaloAlto. I should clarify that I don't mean bullets, per se. The default symbols used for enumeration items in this theme are spheres with numbers inside them. I know how to suppress this within regular enumerate environments, but I can't get the same trick to work in the TOC. –  Kristen Dec 30 '10 at 23:13
Maybe the problem was that ball and sphere lead to the same sphere-ish result as do elephant or any other un-defined string. Either ball or sphere are not defined and since sphere/ball is the theme-standard, it will fall back on this when given a undefined value. circle and square work like expected and default removes the numbers altogether. Thanks to Kristen and Alan, I had the same problem before I came here! –  user39426 Nov 3 '13 at 20:25

Modify font/color of the element section number projected. An example doing some changes, not necessarily beautiful but demonstrating:

\setbeamerfont{section number projected}{%
family=\rmfamily,series=\bfseries,size=\normalsize}
\setbeamercolor{section number projected}{bg=black,fg=yellow}


With PaloAlto theme:

Before, PaloAlto default:

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This almost works. Do you know how to change the sphere to, say, a ball? \setbeamertemplate{sections in toc}[ball] is not working. –  Kristen Dec 30 '10 at 23:43
\setbeamertemplate{sections/subsections in toc}[ball] works for me. Besides ball, there's circle and square. –  Stefan Kottwitz Dec 30 '10 at 23:58
@Kristen It should be {section in toc} (singular not plural) –  Alan Munn Dec 31 '10 at 0:09
@Alan I've tried singular as well. Still not working, but I am about to strangle my PC! –  Kristen Dec 31 '10 at 0:10
@Kristen Then there's something else going on with your document (unless you have an old version of beamer.) If you create a two-frame document with a table of contents and one frame, with the setbeamertemplate command, does it work? –  Alan Munn Dec 31 '10 at 0:20