How pjf makes his prompt so awesome. I actually put the colours in ~/.bash_colours and source that in, but I've in-lined it here for easy gisting. ;)

.bash_prompt

# Reset
Color_Off='\[\e[0m\]'      # Text Reset

# Regular Colors
Black='\[\e[0;30m\]'       # Black
Red='\[\e[0;31m\]'         # Red
Green='\[\e[0;32m\]'       # Green
Yellow='\[\e[0;33m\]'      # Yellow
Blue='\[\e[0;34m\]'        # Blue
Purple='\[\e[0;35m\]'      # Purple
Cyan='\[\e[0;36m\]'        # Cyan
White='\[\e[0;37m\]'       # White

# Bold
BBlack='\[\e[1;30m\]'      # Black
BRed='\[\e[1;31m\]'        # Red
BGreen='\[\e[1;32m\]'      # Green
BYellow='\[\e[1;33m\]'     # Yellow
BBlue='\[\e[1;34m\]'       # Blue
BPurple='\[\e[1;35m\]'     # Purple
BCyan='\[\e[1;36m\]'       # Cyan
BWhite='\[\e[1;37m\]'      # White

# Underline
UBlack='\[\e[4;30m\]'      # Black
URed='\[\e[4;31m\]'        # Red
UGreen='\[\e[4;32m\]'      # Green
UYellow='\[\e[4;33m\]'     # Yellow
UBlue='\[\e[4;34m\]'       # Blue
UPurple='\[\e[4;35m\]'     # Purple
UCyan='\[\e[4;36m\]'       # Cyan
UWhite='\[\e[4;37m\]'      # White

# Background
On_Black='\[\e[40m\]'      # Black
On_Red='\[\e[41m\]'        # Red
On_Green='\[\e[42m\]'      # Green
On_Yellow='\[\e[43m\]'     # Yellow
On_Blue='\[\e[44m\]'       # Blue
On_Purple='\[\e[45m\]'     # Purple
On_Cyan='\[\e[46m\]'       # Cyan
On_White='\[\e[47m\]'      # White

# High Intensity
IBlack='\[\e[0;90m\]'      # Black
IRed='\[\e[0;91m\]'        # Red
IGreen='\[\e[0;92m\]'      # Green
IYellow='\[\e[0;93m\]'     # Yellow
IBlue='\[\e[0;94m\]'       # Blue
IPurple='\[\e[0;95m\]'     # Purple
ICyan='\[\e[0;96m\]'       # Cyan
IWhite='\[\e[0;97m\]'      # White

# Bold High Intensity
BIBlack='\[\e[1;90m\]'     # Black
BIRed='\[\e[1;91m\]'       # Red
BIGreen='\[\e[1;92m\]'     # Green
BIYellow='\[\e[1;93m\]'    # Yellow
BIBlue='\[\e[1;94m\]'      # Blue
BIPurple='\[\e[1;95m\]'    # Purple
BICyan='\[\e[1;96m\]'      # Cyan
BIWhite='\[\e[1;97m\]'     # White

# High Intensity backgrounds
On_IBlack='\[\e[0;100m\]'  # Black
On_IRed='\[\e[0;101m\]'    # Red
On_IGreen='\[\e[0;102m\]'  # Green
On_IYellow='\[\e[0;103m\]' # Yellow
On_IBlue='\[\e[0;104m\]'   # Blue
On_IPurple='\[\e[0;105m\]' # Purple
On_ICyan='\[\e[0;106m\]'   # Cyan
On_IWhite='\[\e[0;107m\]'  # White

# Make our prompt awesome. :)

TICK="✓"
CROSS="✗"

PS1="\[\e]0;\u@\h: \w\a\]"'$(BRANCH=`git rev-parse --abbrev-ref HEAD 2> /dev/null`; if [ -n "$BRANCH" ]; then DIRTY=`git status --porcelain --untracked-files=no 2> /dev/null`; if [ -n "$DIRTY" ]; then echo "'$BRed'$CROSS "; else echo "'$BGreen'$TICK "; fi; fi;)'"$Color_Off${debian_chroot:+($debian_chroot)}\w$BYellow\$(__git_ps1)\$ $Color_Off"