Plot XY points in spreadsheet using paint bucket fill based on cell Coordinates

I have a series of XY points in excel. I want to plot these points on an excel sheet, not a chart, by running a macro to shade the cell that corresponds with the X and Y coordinate listed across the top in numerical order and the left in numerical order (1000 being the zero most point.

Below the Yellow would be shaded in by running a macro to search the XY data in columns K (along the top) and L (along the left) and the label would be taken from column J when shaded in.

I have searched high and low and cannot find an easy solution. Any help or direction I would greatly appreciate your help.

Here is an example of what i am trying to explain above which could be confusing.

Example.JPG