Conditional Merge in 10x10 Area

Hey I have a 10 cell by 10 cell (A-J, 1-10) area which I want to have a 3 by 3 dark bordered box placed in certain areas depending on the contents of two other cells, say K1 (y) and L1 (x). Positioning of the box would be like that of the game Battleship, where you'd list the vertical location with the value in K1 and the horizontal location with the value in L1. So if K1 was 5, and L1 was 5, the 3 by 3 box would be situated 5th cell down, 5th cell to the right.

I have the positioning portion finished ( I can place a single cell in the area), its just a matter of making the 3 by 3 box black bordered box appear as well as having the cells revert back to their original appearance when the values change.

Is this possible to do? Any help would be greatly appreciated.