Quote from RustyXXL
Maybe instead try a different texturepack with support for the mod of your choice? Soartex for example had support for extrabiomes in 1.4.7 and support for ExtrabiomesXL and Biomes o' plenty in 1.5.2
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Quote from Armanbai
Here, check this out :
Not only adds biomes, but few options for worldgen
Quote from nursesaids
Thank you very much!
This looks to be about as close as I feel I'm going to get to what I'm looking for.