J.M.
My daughter's 2nd birthday party is this weekend. I decided to just stick to the classic theme because it is adorable and kids love it:
Princesses and Superheros
Kids will come in costume and we'll have a fashion show, dancing with maraccas, bubbles, parachute play, etc.
For a 6 year old, a local clown may be a hit, or if you have a friend with a good singing voice/energetic, maybe she could dress up as a princess and do princess story time, etc. A guy could be a superhero and save the day.
A treasure hunt to find the goodie bag you give them at the end...
Cookie decorating...
Picture frame making/decorating (you keep the frames and mail them back to each attendee with a picture and thank you card)
I hope this gets your creative juice going.