I can tie Rhose's 86 by a tiny adjustment to yours: 
$j=1;print$"x--$h,$_-1?map(rand>$f?"=":qw(
0 @ * +)[rand 4],1..($j+=2)):"*",$/for 1..$h

[download]
I moved a set of parens. And I can trim it even more: 
print$"x--$h,$_-1?map(rand>
$f?"=":qw(0 @ * +)[rand 4],
1..($j+=2)):"*",$/for++$j..$h

[download]
I moved $j's assignment to the "fore" loop. 83 characters. And then another adjustment that gets rid of $j entirely, and puts me at (an updated) 77 -- the parens around map's arguments were unneeded. 
print$"x--$h,$_-1?map rand>
$f?"=":qw(0 @ * +)[rand 4],
2..$_*2:"*",$/for 1..$h

[download]

_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Re: (Golf) Decorating the Christmas Tree by japhy
in thread (Golf) Decorating the Christmas Tree by Masem

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