color your prompt based roughly (1/8*2 hashing) on hostname -f output. Also strip vowels from hostname to give a shorter prompt.

hashpromptshort.sh

if [ "$PS1" ]; then
        if [ "$BASH" ]; then
                shortname=${HOSTNAME%%.*}
                shortname=${shortname//[aeiou]/}
                hostname_crc=$(echo $HOSTNAME | tr 'A-Z' 'a-z' | cksum)
                hostname_crc=${hostname_crc%% *}
                hostcolor_a=$(( (0x${hostname_crc} + 1) % 2 ))
                hostcolor_b=$(( 0x${hostname_crc} % 8 + 30 ))
                PS1="\[\e[33;1m\]\u@\[\e[${hostcolor_a};${hostcolor_b}m\]${shortname}:\[\e[0m\]\w"'\$ '
                PS2='\[\e[31;1m\]>\[\e[0m\]'

                unset shortname hostname_crc hostcolor_a hostcolor_b
        else
                if [ "`id -u`" -eq 0 ]; then
                        PS1='# '
                else
                        PS1='$ '
                fi  
        fi  
fi

export PS1
export PS2