I don't think the rules are clearly defined, so here's my attempt to clarify them (though Masem is the final arbiter, of course :), it sounds like we assume that $h and $f are already set, and so don't count that assignment, though we do count the assignment of the 'decoration character class'. So following what I think are the rules (subject to clarification), here's my try weighing in at 96 characters:

$j=-1;print" "x(--$h),map({$_==1?"*":rand()<$f?(qw(0 @ * +))[rand 4]:"
+="}1..($j+=2)),$/for 1..$h
[download]

Update: Curses! foiled again :-)

Though japhy's reply does lead to this 87 character answer:

$j=1;print$"x--$h,($_-1?map rand>$f?"=":qw(0 @ * +)[rand 4],1..($j+=2)
+:"*"),$/for 1..$h
[download]

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