There is a show-accurate Mystery Mini figure of Lyra, but it's one of the Hot Topic exclusives :/ You might be able to find it on Ebay, as some Chinese sellers sell factory seconds now and then for fairly reasonable prices.
There are currently three different Lyra blind bags - two Twilight Sparkle mould, one with a green tail with a white stripe, one with an entirely white tail, and a Rarity mould one.
I think there is some variation between the three brushable releases, but I only own one so I couldn't tell you what they are. It's a shame, as she's my favourite pony, too
Hopefully BAB will give her to us soon....