Kamran,
These were taken with the 3rd of 3 softboxes I have made (well, 4 if you count the original paper prototype). I have written up the first two in my blog:
I made a softbox for my flashCollapsable softboxThe third one is the same basic design as the first, but is longer and smaller. I specifically designed it for 1:1 and larger where I don't need to have such a large surface for the light as my subjects are much smaller. With a smaller area, I can concentrate the light more and have more flexibility on f/stop. It is also lined with aluminium foil for maximum light making it to the light surface.
Here's a shot of it on my old D70. The lens is focused on the left most flower.

The softbox is not all that glamourous, but gets the job done.