I downloaded a folder for placing exploding bubbles in you maps, called 'Exploding Bubbles'. The ReadMe installation
Place the appropriate files, ODF, TGA, MSH, FX, in the corresponding folders (ODF in ODF, MSH and TGA in MSH, FX in EFFECTS). Then load up ZE and place it as you would any other object.
Here is the link, you can check it yourself: http://starwarsbattlefront.filefront...g_Bubble;99158