Garden of Glass is a Botania addon. Having installed will allow you to create a skyblock type world. Aside from allowing you to have a skyblock world, a few items and blocks are added, as well as some recipes in botania tweaked to fit the skyblock. The goal of this addon is to allow for every single item in the game to be acquired properly in a skyblock evironment.
Download link: Garden of Glass Mod 1.7.10