Making Custom Beds

So. I ave a mod idea. Beds are very important to this idea. I don't know where to go in the MCreator app for a bed sprite sheet. I need two beds at least. Maybe variants off of those two. A Nether Bed and an End Bed. Both explode in the overworld. The end bed has the largest explosion, nether bed has second largest explosion. They will both be used to craft something to really get into the meat of the mod. 

Just need help figuring out how to make custom beds.