Issue with LCD screen colors after Mac was dropped
The color changes indicates the possibility of a loose, flat-band cable connection between the LCD display and the mainboard.

That DIY does not cost anything (but it is not easy to do) and might help in your case to make sure the cable connection is firm on both sides.

Go to ifixit and find your Macs instructions (or similar model) if not available.



If it is not the cable, you have 2 choices:


Replace the screen your self to save money.
Use the ColorSync app in the Utility folder and modify the colors profiles there.