Pages is a mod that adds, um—pages—to Mystcraft. Currently it adds a total of 662 blocks from vanilla Minecraft as well as the following mods: Applied Energistics 2, Biomes o' Plenty, Botania, Ender IO, Extra Utilities 2, Immersive Engineering, RFTools, Thaumcraft, Thermal Foundation, Tinkers' Construct, and The Twilight Forest. The only required mod is Mystcraft.
If you want to add a page for a block for everyone to enjoy, please make a pull request on GitHub. The block list is in csv format, so you can edit it with any spreadsheet editor! For information about what each column does, see https://github.com/TheFloydman/Pages/wiki/CSV.
Pages also supports easy editing of pages in your personal Minecraft instance. Simply head to config/pages and you'll find blocks_[version].csv and blocks_custom.csv, which you can edit directly. The former will get a new version every time this mod updates, and the latter will not be overwritten or replaced when you update, so whatever you add now should continue to work later unless there is a dramatic change to the format.