I think I agree with the general sentiment that these, for the most part, aren't particularly good.
Vamipre Stilletto: Can't see the card, but I'm guessing its ability reduces attack from the description. That could work (though I don't know if it fits the theme of Vampirism as set for this game). However since I can't see the card I have no idea.
Lycanthrope: This is probably one of the two best submissions that I can see, but I still prefer the original over this suggestion. The ability is a little more interesting, but I don't think the game needs more infection/transform effects right now. It gets one of my votes.
Minor Vampire: I prefer the original ability. This one is clunky and again infection/transform effects aren't really needed.
Vampire: Blood Lust is actually an interesting ability, but it's kind of like a one-turn scavenger which costs quite a lot. The card is IMO a little underpowered; I'd certainly prefer to take the original version in my deck over the suggestion.
Hematite Golem: Horribly clunky mechanic which would be a nightmare to sort out all the edge cases for, and probably not hugely useful. Still, quite imaginative, so points for that.
Abomination: Nice mechanic, but I'm not sure about the random skill, which could make these cards extremely powerful. Multiple-use destroy or steal can be incredibly powerful, and getting one of these out on the first turn will be a game-winner. Having said that, this is the most interesting reworking I've seen so it gets my other vote.