Thumbnail issue in Hegel!

Hi,

I've recently changed my site from Mondrain to Hegel because of thumbnail freedom. I am facing couple of issues here in Hegel.

1) I have couple of GIF bigger thumbnails but they are not working properly when I place them, try to read on forum but no success please help me.

2) How can I have all unique size thumbnails? And if I want to increase just size of one thumbnail how should I do that?

And last one 3) How can I change background colour in CMYK? and add border to the page?

As you can see I am still very new on Cargo so please bear with me.

Thanks in advance.

Cheers
Baba