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Without looking into it too much I think the Icicles are stored as a buff on your character.
So, I would do the following to turn this into an addon..
1. Set up the texture points around the screen and fill it with the icile image but set the alpha value for the texture to 0 to make it invisible.
2. Monitor the player's buffs for the Icicle Buff and keep a record of how many icicles are available.
3. Cycle through the texture points and turn off/on the icicles you want based on the number available.
It sounds simple but it could be harder than it seems. However, you probably won't be able to turn off Blizzards icicle display so the effect will be repeated .. but while testing this is a bonus as your addon should match the blizzard version.
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