Note: You will need to right click in this so if your mouse has only 1 urr... clicky thing then this is not for you.

First Get a sprite sheet(or anything that uses a certain amount of coors multiple times).

Here we will give tails grey fur:
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As you can see I already got the colors I want.
Now use the Eye dropper tool
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Left click one of tails' colors.
Then right click the color you want to use to replace the color you left clicked.
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Now switch to the eraser.Set it to a big eraser(If you want it done fast)Then right click through the whole sheet.
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Wow! its just lke magic!
No more paint bucketing through the whole sheet.
Rinse and repeat to finish the whole sheet.
All in 5 minutes.
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You are allowed to use this tutorial anywhere. But I want credit.
Please.