I agree that the part of the issue with many of the Vennies is the way they keep popping up in unknown or unseen colour combinations [minor or major!] And more often than not its completely unexpected ebay sales.
I think of the ones I have seen:
1) Yellow with pink hair and red tulips - yes sounds similar to her original but as with most Vennies the colour is just a little more intense*
2) Coral with pink hair and red tulips*
3) Green with pink hair and red tulips*
4) Coral with dark yellow hair and red tulips
*All the same shade-ish of pink hair
And then there is a white and a dark aqua/bluish squeeky butt as well.
That is the only ones I can think of.