This component is full of bugs.
I installed last release (com_fabrik_2.0rc3.zip) and I can't publish forms on frontpage without mistakes.
There is the possibility to use svn versions but theese are full of bubs too.
I spent a week to fix this on my lamp without success.

Thanks to effrit patch you can use very light syntax too

{slimbox images/big/, images/small/}
Or
{slimbox single images/big/, images/small/}