Show frost mage icicle as part of UI

[Ethly]

I want to write addon which will show frost mage icicles around the character (at predetermined positions of the screen). I want them to rotate slowly with some animation (and being 3D, of course). Is it possible with addon API or I should stick with 2D images? How do I find 3D object name for icicle? Will it hurt performance (I don't expect it, there are plenty of 3D objects in the scene and 5 more probably won't make a difference)?