Generate squares

Here is my problem:

I have an area of 730x334. I want to generate 77.3x66.8 squares that will fill the entire area. I will obvisouly need 5 lines of 10 squares. I need the squares to NOT be generated in order. They need to be generated randomly within the area. And I need the time to be about .5 seconds.

If anyone can give me a shove in the right direction it would be greatly appreciated!

Thanks