In terms of stuff that has been played with/used....(some now, some when younger)

Best -
Schleich horses
Copic markers and sketch pads
Sims PC games
Littlest Pet Shop stuff
Plastic food and crockery
My Little Pony
Studio Ghibli DVDs
Cardboard boxes, glue, icy pole sticks, etc (the kid loves box construction....still :/ )
Barbie horse and rider
Fashion style sketch books
Monster high dolls

Worst:
Stuffed toys (although she has her faves)
Board games (not helped by only child status)
Puzzles (once they're done, she won't do them again)