I have a baby shower cake due for a friend in a couple of weeks and I am a little stuck. Any advice would be helpful.

2 tiered cake the bottom tier would be covered in pink butter-cream with stripes of fondant covering it, the colors would be different shades and widths of pink and green. Then I was thinking making some gum-paste baby blocking spelling out Welcome Baby Olivia and using that to circle each tier so that would solve my border issue. Then I would have little fondant and gum paste flowers and butterflies all over the cake. The baby blocks would be white, pink and green.

I am a little stuck on the second tier which would be covered in fondant not sure what color yet. If i should do polka dots or just leave it a simple covered fondant tier. Since there would so much already going on the cake. What do yall think?

You do already have a lot going on... I would make it solid green or solid white... I think it will be really pretty though!

Yes, green w/a very few b'flies and flowers scattered around.

IMO - I would go for solid white with a few butterflies or flowers on it just to tie the tiers together.

i am just starting to research baby shower cakes now for my niece and found this idea on cc http://cakecentral.com/gallery/336773 it has pastel coloured buttons looks very cool, hope it helps

Keep it simple on top. One thing that really gets me is these cakes that have this fantastic work but are so cluttered up you can't focus on any one thing.

What about doing it something like this
http://cakecentral.com/gallery/2083757/

using pink on tier 1 with pink, yellow and green stripes and then using yellow or green on top tier. You could do the polka dots in all the colors. Then put the baby blocks on top to announce Olivia's welcome.

I'm with these guys...Stripes and flowers and butterflies-all on the bottom tier seems a little busy. Maybe just the stripes on the bottom and use the same colors with a few flowers on the top tier. I recently did a cake in those same colors with stripes on the bottom tier and dots on the top tier. Here's how it looked (just ignore the giant cupcake on top)

http://cakecentral.com/gallery/2068977