This project is abandoned and its default file will likely not work with the most recent version of Minecraft. Whether this project is out of date or its author has marked it as abandoned, this project is no longer maintained.
XenCraft is an XyCraft inspired mod, but with very different mechanics.
First step is to find the Xen Ore. It doesn't matter what color you break, it will always drop the same Xen gem.
Next, you craft yourself some Xenstone and a Xen Crafting Table.
Here, you can select the color by clicking on the small color buttons and pattern by clicking on the large button. Then place Xenstone or any previously crafted block in the input slot and you will get new variant in output slot.