My kitten is very picky with toys as well. I find it's best to stick with one or two toys a week and put the others up in a cabinet. You definitely have to be inventive and sometimes mimic prey so you can capture the interest of your kitty.
Seth's absolute favourite is the Cat Dancer Toy and her second favourite is a feather fishing pole toy. She also has two small plush toys (a little blue mouse and white pig) which are her babies that she plays with when we aren't around (well, we peeked
) and keeps in her sleeping area.
Just be creative and keep trying until you find something that sparks your kitty's interest!