looks like:
pregnancy test thing
shopping list with all new baby things on it
cover of a baby book
bag of diapers
birth certificate
death certificate for the rabbit (or a letter stating Dear XYZ, we are happy to inform you the rabbit died.)
(totally obtuse -- recipe for rabbit stew -- with a little note -- Well, what else do you expect me to do with a dead rabbit!)
box of cigars with yellow bands (unless you already know the gender)
calendar with approximate due date circled.
one of those siggy line counters that marks off the months until....
baby block
(extremely totally obtuse: a penguin smiling really big -- from Neil Simon's female version of The Odd Couple where one of the characters announces she's pregnant by saying "the penguin came through" having earlier called her husband a penguin after finding out the birds only have sex 1x a year.)
front of a birth announcement but it only says: It's a .... (yet to determined) could add "and we hope it's a .....(state your preference)
plaque with the baby poems what are little boys and little girls made of
paint chips -- two colors -- one labeled "if its a boy", the other "if it's a girl"
I love all of Doug's ideas. However, if it were me making the cake -- all of those sound beyond my abilities!!! So, if you need something simpler, how about:
2 + 1=3
In case anyone doesn't get it, you're having "a little one" and then your family grows. Just a thought!
Edited to add: Okay, somehow the different sized fonts failed me!!! Make the 2 and the plus sign normal size, then a teeny, tiny number one, the equal sign normal size and the 3 much larger.
I would write on it:
"Our family is growing by two feet"
then put two baby footprints underneath that. 
Good ideas Doug!!! I will remember those when I'm stumped. 
and another:
t-shirt cake --- possible slogans for front:
> construction zone next nine months
> this space occupied next nine months
> baby zone
> rub my belly -- I break your face!
> shhhhhh.....baby sleeping
> for the family guy fans: praying its not a Stewie!
> just give me chocolate, pickles, and ice cream and no one gets hurt.
> T-9 months and counting
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make 2 small (like 6" round) 4 layer tall cakes -- make one look like a quart of ice cream, the other a jar of pickles -- place on a board together. Saying: ah the cravings of pregnancy.
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we didn't do ours with cake but when we were expecting, we brought my in-laws a saucer magnolia tree with a card that we had written, 'we're adding a branch to the family tree" and they planted the tree and we have a "my little gir'ls name" tree at mimi and papa's now that is almost 4 years old (she'll soon be 3) so you could use that same sort of thing maybe do a tree with branches with family names with "Baby (your last name)" on one of the branches and see who notices it first? just a thought, can't wait to see what you decide on!!!
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