iscambe, use any color you need!
but don't use too many different colors... (basically: not more more than 4)
use the "extra > color wheel" to choose matching colors.
most of the time, the color you will be using, will be defined around the logo or pictures you're using.
basically: there are no good colors to use :-)
not in the general sense.
ciao
a.l.e
ps.: well, if you're starting with scribus, you should be rather conservative when choosing colors: use color that don't look too aggressive and keep a good contrast among colors