I assume you're talking about things like shield ANIs?
I'm no expert, but here's the procedure I was planning-
1. Make a low-res render of the ship from the top.
2. Make it grey, using Irfanview or whatever else I need.
3. Extract a ship with similar proportions- I was planning either Pegasus or Perseus.
4. Extract all PCX's in the ANI, and replace the one with just the ship with mine.
5. Recompile into new ANI, and I'd be done.
Of course, this is a procedure I've planned, but have yet to execute- my ship isn't done yet.

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