foley ideas

In the past I've only used these forums for software specific questions but I've run into a problem with foley recording and I don't know where to turn.

I shot a short horror film and am now cutting and mixing it myself in final cut pro. In the movie there are two major horror effects and neither sounds like the real thing in the production audio. Does anyone have suggestions for foley ideas for the following two actions???

-A guy gets his arm chopped off with a butcher knife in one swing a little above the wrist.

-A girl cracks her skull open on a tile floor.

Ideas???