I have updated the Ice Spikes biome (MUTATED_ICE_FLATS) as it was originally called. I plan on updating some other biomes when I get a chance (Mainly based on request). Right now I am trying to get my server up and running and I am picking ones I plan to use for right now. However, I will try and work on other biomes when I get a chance. I think I will start another thread eventually that will be dedicated to restoring old biomes.
I am not sure how close my updated version is to the original but it should be close enough. If the spikes are too dense for your liking you can modify the .json file provided (I recommend Notepad++ for editing .json files). To change the density search for "customTrees" or look on line 285. From there you can change the density per each spike.
Link to Updated Biome (Working as of V8 Pre-Release 3): https://goo.gl/A95JPb
A few Pictures from a world of JUST this biome: