>I'd like to get "smooth", "beautiful", "pretty", "cool" e.t.c. sound for
>background,
>something like "pad" sounds from standard GENERAL MIDI  set.


Granular does a good job at generating pads.  Try
http://www.werewolf.net/~hljmm/csound/granulr2.orc , sco

Otherwise use band-limited analog synthesis with resonant filters with lots
of detuned sawtooth oscillators and filters all sweeping slowly in different
directions.

Regards,
Hans Mikelson