I love a good string....curly thin strings are fun. Sometimes a ribbon is too fat or flat....
Lots of flowers in different colors (I use them even on my boy layouts), variety of greenery
I also like to have simple stitches or a staple.
I love solid cardstocks. I have been known to make my own if a kit doesn't have them.
Wordbits are fun too...I love to add them to my layouts...probably too much