I looked through the topics and I didn't see anything about this so I figured I'd post it up to help out with recolors so they don't take forever
For me it helps to zoom in to 6x or 8x to make sure you don't select the wrong colors
1)Pick the image you want to recolor
2)Pick out the new colors you want to use
3)Select the Eye-Dropper tool
4)Right Click on the new color you want to use
5)Select the Eye-Dropper tool again
6)Left Click the old color from the sprite
7)Select the Eraser (it may seem crazy but stay with me here)
8)Right click and hold down the button and run the Eraser over the old sprite
...and the old color is replaced with the new one
9)Repeat for other colors/other shades of the color
and there you have it, fast accurate recolors