I will be making 2 tier cake for first birthday. I tried to find some inspirations with no luck, except 2-3 cakes. I  just cannot picture it in my head. Something cute, girlie but with potatoes on it. :) Any ideas?

How about these:

http://www.google.co.uk/search?q=small+potatoes+birthday+cake&hl=en&tbo=u&tbm=isch&source=univ&sa=X&ei=MZX-UPvqH4WRhQf8iIDQCg&ved=0CF0QsAQ&biw=850&bih=403

http://cakecentral.com/g/a/2358888/small-potatoes-cakes/

Have them doing something, like putting up a Happy Birthday banner, and one of them stringing balloons or something. Make it look like they're not done yet, where part of the banner is still hanging down or something, some of the balloons aren't done....somethin like that is what I would do. Little party hats, confetti...