You would receive the skin as an item, it will be equitable. We might turn it into a rare item as well, donating would simply give you it every time you spawn.
We also don't want p2w, giving out handguns to be people who simply paid shouldn't get the benefit of going around killing people so fast. We could maybe do food or drink, but nothing that will affect another players gameplay greatly.
Or perhaps you can spawn with a slightly bigger backpack, then again these are thoughts and we haven't done it yet.