A picture of the two can be found here.
I'm not sure what to do with them, I've tried a few things.
I've tried putting each crystal in the four open crates at the back, I've tired giving the rock dude the crystals, I've tried putting them all in the fire and water. I can't seem to find anything. Anyone else got anything?
EDIT: I didn't find him there! He was behind a tree to the left of the house. I found that running into his legs sometimes caused him to jump up so I pushed him to the middle to see if it did anything. It didn't.