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Steer clear of anything with added dyes or chemicals.

This video explains it well. Basically it's chipped wood from smaller branches and leaves. A source would likely be calling tree service companies in your area and asking where they he wood chips end up. You are not looking for fresh chip but need aged chip.

I would wait til they destroy it all. Adding shavings on top of grass can trap moisture (in this case the moisture already in the grass) and rot/mold. Instead of shavings look for aged wood chips. It's chunkier and won't pack down like shavings can.