M-x apropos [RET] set.*color

ってやると set(何ちゃら)colorという名前のコマンド・
関数・変数などの一覧を表示したバッファができる。

M-x apropos-command [RET] set.*color

ってやると set(何ちゃら)colorという名前のコマンド
一覧を表示したバッファができる。

If moving the mouse over text changes the text's color, you can click
mouse-2 (second button from right) on that text to get more information.
In this buffer, go to the name of the command, or function, or variable,
and type RET to get full documentation.

set-mouse-color M-x set-mouse-color RET
Command: Set the color of the mouse pointer of the selected frame to COLOR-NAME.
set-border-color M-x set-border-color RET
Command: Set the color of the border of the selected frame to COLOR-NAME.
set-cursor-color M-x set-cursor-color RET
Command: Set the text cursor color of the selected frame to COLOR-NAME.
set-background-color M-x set-background-color RET
Command: Set the background color of the selected frame to COLOR-NAME.
set-foreground-color M-x set-foreground-color RET
Command: Set the foreground color of the selected frame to COLOR-NAME.

さらに...