Too bad about your lost images.

The Gallery should hold your image files safely.
Unfortunately, I haven't updated Windows on my computer so I'm currently a bit limited in using file-sharing services. I can only set up the images from the thread. You should upload your high-resolution files personally. However, if you stay too busy I can always set up your thread images, instead.
How I do it: Your monsters are also worth saving safely, so first go to
Board index ‹ Gallery ‹ Artchives ‹ Card Art ‹ Monster and Mercenary Art. You want to hit the
[NEWIMAGE *] button (above the top row of images, on the left.)
On the UPLOAD IMAGE screen, hit the
[Browse...
] button next to the open File field and select your image from your computer. Then hit the
[Continue] button below to...upload....
I imagine you can alternately grab the file info straight from flikr and enter it directly into the File: field, then hit
[Continue] to upload.
On the second UPLOAD IMAGE screen you should see a preview of your image. Retitle your pic and fill in an image description if you feel the need.
Don't forget to save the monster backgrounds at
Board index ‹ Gallery ‹ Artchives ‹ Card Art ‹ Generic Backgrounds.