Ok, let me be very clear from the start - I'm not looking for an basic image gallery solution. I did not found any solution from the WP-plugins.net, so my hope lies in here. :)
I want to spread my custom made backgrounds for monitors. One background and it's resolution versions would be inside one "post". I planned a way that listing would be in a category 5 thumbnails horizontally (can I run a loop for 5 times and then restart until there is no more posts?).
Thumbnail of the background
<-- more -->
Now viewing size 800x600 pixels
Choose different size
The image should be showing inside the post, in the layout. And when I click some other versions the same.