S.G.
i had a good friend throw me a baby shower for my youngest not too long ago (well, i guess it's been almost a year now) and we were BOTH broke, and it ended up being really nice. my favorite thing she did was make me a diaper cake. i've seen them on tv since, but the lowdown is you take a few packs of diapers and tape them all together and form differant layers for the 'cake'. then she got some toys from the dollar store and a couple packs of the little loops that you can attach together/attach toys too to decorate the cake. it was great, b/c it was the centerpiece and i was able to take it home and USE it :) i also agree w/the other mom's about hitting up the dollar stores, or you could also try goodwill/salvation army's. if you're creative, you could make the signs and i'm pretty sure you can get streamers and favors at the dollar stores... good luck!! :)