All blocks added by this mod do are not collideable, meaning you can walk right through them.
They are also INVISIBLE. All blocks emit a tiny colored particle, when you're holding one of the Blocks or the Light Editer. If you're not holding any of these items, the blocks also won't show a Hitbox.
Demonstration:
Different Lights have Different Particles.
Lights:
Simple Light
Just emits Light, Light Level 15
Redstone Light
Like a Simple Light, but can be toggled with Redstone
Invertable
Dimmable Light
Can emit every light level from 0 to 15
Change values using the Light Editor
Dimmable Redstone Light
Like a Dimmable Light, but can be toggled with Redstone
Change Values using the Light Editor
Invertable
Comparator Light
Takes an Input Redstone level and transforms it to a light level
Invertable
Particle Emitters:
Simple Particle Emitter
Can emit one out of 16 pre-set Particles. Cannot be modified
Light Variant exists
Advanced Particle Emitter
Can emit any particle and can even create Particles with custom Texture
Highly modifiable using the Light Editor
Sound Emitters:
Simple Sound Emitter
Can emit one out of 16 pre-set Sounds. Cannot be modified
Light Variant exists
Advanced Sound Emitter
Can emit any sound at different intervals with different pitch and volume
Highly modifiable using the Light Editor
Here is a Preview of some of the things you can do:
For Crafting Recipes, I highly suggest you use JustEnoughItems (JEI)
Feel free to use this mod in a modpack, as long as it's hosted on curse.