R help - Apr 2011 - is there a way/library for generating colorful noise in R ??

I would like to generate some noisy time series. I know that it is possible to
"classify" noise by looking at the exponent (beta) of the relationship
between the spectrum of the time series and the frequencies (i.e. spectrum ~
frequency ^ beta ).
Is there a way to generate White (beta=0), Pink (beta=-1), Brown (Beta=-2),
Blue(beta=1) and Violet (beta=2) noise in R ?.

Thanks.