Try adding this at the end of
.bashrc:
# prompt - courtesy of Rasterman, Gnea and JoelP
GRAD1='\333\262\261\260'
GRAD2='\260\261\262\333'
YLOBRN='\[\033[01;33;43m\]'
WHTBRN='\[\033[01;37;43m\]'
REDBRN='\[\033[00;31;43m\]'
REDBLK='\[\033[00;31;40m\]'
PPLBLK='\[\033[01;35;40m\]'...