Take the blur tool and blur up the corners and edges a bit.
Step 17
Create a new image about the size of the original square. This image will be for the dots on the dice. I made mine 90X90.
Step 18
In the new image on a new layer, create a small circle and fill it with white. Make sure that view>snap is checked, then move the circle to the upper left-hand corner
Step 19
Duplicate the layer 3 times, and move one dot to each corner.
Step 20
With only 1 layer selected, press ctrl-a, then ctrl-c to copy the dot. Press ctrl-v and the dot will be pasted into the exact middle of the image as long as the entire image is selected.