Here is a list of mods that have support for Biomes O' Plenty in some way:
Atmosmobs: http://www.minecraft.../topic/1126195-
Requires Mob Spawn Controls for mobs to spawn in new biomes
Witches and More: http://www.minecraft.../topic/1366410-
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Here is a list of texture packs that have support for Biomes O' Plenty:
PureBDCraft: http://bdcraft.net/f...s-o-plenty-v040
Lithos:Core 32x (supports BoP from 1.6x to 1.9x) http://mods.curse.com/texture-packs/minecraft/lithos-core-32x-1-6-1-10-complete
Smoothic: http://www.planetmin..._pack/smoothic/
Tronic Faithful: http://www.minecraft...ronic-faithful/
128 x 256 Faerielight: http://www.minecraftforum.net/topic/1386414-
[64x] reilem's Texturepacks for Mods: http://www.minecraftforum...reilems-texture biomes-o-plenty
Dandelion: [1]
4) go to your Minecraft Folder
and switch to: ".minecraft\mods\Biomes-O-Plenty-0.5.3\mods\BiomesOPlenty\textures" folder.
5) open the downloaded .zip with Winrar or something similar
drag and drop all folders and files in .zip to the textures folder.
6) integrate all folders and replace all files.