For tagging. See the Ingewrapper update of today -- they now have labels in s4pe, but with that huge list there is a lot of scrolling involved if one only wants to add a colour. So for convenience, here's a list of all default colour tags with their decimal and hex value:

Numerical:

065 | 0x0041 | Color_Red
068 | 0x0044 | Color_Blue
069 | 0x0045 | Color_Green
090 | 0x005A | Color_DarkBrown
091 | 0x005B | Color_Brown
092 | 0x005C | Color_Gray
093 | 0x005D | Color_Black
095 | 0x005F | Color_Orange
097 | 0x0061 | Color_Amber
098 | 0x0062 | Color_Aqua
099 | 0x0063 | Color_HazelBlue
100 | 0x0064 | Color_HazelGreen
101 | 0x0065 | Color_LightBlue
102 | 0x0066 | Color_LightBrown
103 | 0x0067 | Color_LightGreen
104 | 0x0068 | Color_Yellow
105 | 0x0069 | Color_White
106 | 0x006A | Color_Pink
107 | 0x006B | Color_Purple
108 | 0x006C | Color_Burgundy
109 | 0x006D | Color_Cream
256 | 0x0100 | Color_Silver
257 | 0x0101 | Color_Gold
258 | 0x0102 | Color_Magenta
259 | 0x0103 | Color_Teal
260 | 0x0104 | Color_Turquoise
261 | 0x0105 | Color_BlueNavy
292 | 0x0124 | Color_BlueLight
293 | 0x0125 | Color_BrownLight
294 | 0x0126 | Color_Beige
311 | 0x0137 | Color_GreenNavy


By colour:

107 | 0x006B | Color_Purple
261 | 0x0105 | Color_BlueNavy
068 | 0x0044 | Color_Blue
101 | 0x0065 | Color_LightBlue
292 | 0x0124 | Color_BlueLight
259 | 0x0103 | Color_Teal
260 | 0x0104 | Color_Turquoise
098 | 0x0062 | Color_Aqua
069 | 0x0045 | Color_Green
311 | 0x0137 | Color_GreenNavy
103 | 0x0067 | Color_LightGreen
104 | 0x0068 | Color_Yellow
097 | 0x0061 | Color_Amber
257 | 0x0101 | Color_Gold
095 | 0x005F | Color_Orange
065 | 0x0041 | Color_Red
108 | 0x006C | Color_Burgundy
258 | 0x0102 | Color_Magenta
106 | 0x006A | Color_Pink

294 | 0x0126 | Color_Beige
099 | 0x0063 | Color_HazelBlue
100 | 0x0064 | Color_HazelGreen
102 | 0x0066 | Color_LightBrown
293 | 0x0125 | Color_BrownLight
091 | 0x005B | Color_Brown
090 | 0x005A | Color_DarkBrown
093 | 0x005D | Color_Black
092 | 0x005C | Color_Gray
256 | 0x0100 | Color_Silver
105 | 0x0069 | Color_White
109 | 0x006D | Color_Cream

From my recent playing about with colour tagging of objects it would seem that LightBlue and LightBrown aren't used on objects but BlueLight and BrownLight are. Just thought I'd throw that out there.