thank you do you mean the vignette? it's no secret it comes out looking like that with my Holga most of the time, and it got enhanced in this photo because I added the Polaroid textures. but you can digitally add a vignette too: if you have Photoshop CS2 or higher you can add your own by going to filter/distort/lens correction; there is a vignette option there.
you can still create a vignette with an earlier version of PS, it just takes a little longer: - open the image you want to use - click the rectangular marquee tool in the left vertical bar - make a rectangle over the image quite close to the edges of the image - right click the image and select feather - set your desired feather radius to somewhere between 100-150 pixels - right click the image again and select select inverse - go to the filter tab and select blur. you can pick most of the blurs there but I like to use box blur or lens blur - set the blur radius pretty high; mine is usually set around 400 pixels - go to the edit tab and select fade *** blur - set it to the multiply mode, and this will darken the corners of the image creating a vignette of sorts (and you can control the darkness of the edges by adjusting the opacity) hope this helps
I still do the vignette this way sometimes; like you say, it gives you a little more control (oh and another tip: if you want the vignette a little more uneven, use the lasso tool instead of the rectangular marquee tool)