I don't really know much about music, so I'm just going to guess at what you're asking for. A lot of the songs on the soundtack are more atmospheric than melodic, but here are a few tracks that might be easier to remix.
The Gribbler [song #8]
The Gargoyle and the Labyrinth [song #12]
The Storm and the Sea [song #13]
The House of All Worlds [song #19] (although this was already used as a source song for deim0s' remix)
The Ghost House [song #26] <-
The Road Back [song #28]
Epilogue [song #29] <-
End Credits [song #30]
Winterland [song # 32] <- (this one is probably my favourite on this list)
I know I listed a lot, but I marked (<-) the ones that'll likely have the most material for you to work with. I'm still hoping that Shark [song #36] can be worked in somehow, but maybe that's asking too much. Anyways, let me know if this doesn't help.