I sure hope there will be a Wander over yonder snow globe.

@(T_a)  
You mean like, the “the galaxy is just a marble” thing from MIB?

My little Pony: Friendship is Magic and Fosters Home for Imaginary Friends… The universe might actually implode if such a crossover actually happened!

Pinkie: Now I wonder what is inside this one…  
Bubbles: is peeking out the window GUYS! The pony’s back!  
Buttercup: Sure it is, Bubbles. Let me guess: It’s brought a friend.  
Bubbles: Actually, yes! A purple unicorn!  
Blossom: Yeah right. Bubbles, just ignore your imaginary friend, okay?  
Bubbles: It’s not imaginary! I’ll show you! pushes Blossom and Buttercup towards the window See? See?  
Blossom: looks out the window Holy cow you’re right!  
Buttercup: Well, you know what this means!  
Blossom: No Buttercup! No fighting… yet. It could be friendly!  
Twilight: horn glows and snow globe rises  
Bubbles: AHHHH! hugs Blossom It’s causing an earthquake!  
Buttercup: NOW can we fight it?  
Blossom: No! We have to stop that earthquake first! Then we can fight it.  
Buttercup: Aw yeah! flies off  
Twilight: There doesn’t seem to be anything here- hey, what’s that? green light streak inside snow globe  
Buttercup: smacks into glass Ow! What the- feels the glass Is this… glass?  
Pinkie: sticks her face up against glass HAI!  
Buttercup: AH! jumps backwards What the heck?!
 
And because the OP is running out of space and this is a very long comment already, the end. If you want more, ask :P

What happens when you shake it?

this is cool

@Cloverfreak  
No no no  
You got it all wrong  
The snowglobes only represent a small part of the whole world, the things inside of the snowglobe still move freely, as if they were in their worlds, but are view is just limited to their house

Why is this reminding me of ‘The Shining’?

Fausteption!

If the PowerPuff Girls are in that snow globe, then who’s protecting Townsville?!