I have no daughters, but my first son had Sesame Street Trains (characters on a train 3D puzzle went on his cake) for his 1st bday, and 2nd son had ducks.
For 2nd bday, DS 1 had Pooh, and DS2 had frogs.
For 3rd bday, DS 1 had Candyland, and DS2 had Build A Bear/Firefighters (I bought firefighter outfits for the kids and the bears they made, it made a great group pic).
For each, I did their cakes myself, came up with games/crafts myself (but used Oriental Trading for materials), and they helped me do invitations. None were prepackaged, but I was able to find the second bday paper goods, and the ducks.........the others I used solid color paper goods. We always do a pinata that goes with the theme, for Candyland, my dh paper machied one of the characters (the gumdrop guy).
For DS2's 4th: We'll be doing Wild Animals........going to AK.
DS1 other birthdays:
Age 4: Letter N party (his name begins with N)
5: Giant party
6: Aliens
7: Golf (we did miniature)
8: Spiderman (at Universal)
9: Medieval
10: Yu-Gi-Oh
11: He wants medieval again.........I'm going to try to spin him towards maybe a chess-based (he loves the game and it can slant towards medieval battles), or Narnia