I asked "without cheating"...
It is pretty easy to add new lines without needing to use "hidden characters" (just do newlines). But since I have tables with images with different height, adjusting them with newlines is just not really good. To make it look good I would need a "valign" option or something like that. But I don't know whether there is any or not (and how it is named). [Also you can't hit the middle if there is an even number of lines]
I have figured that there is a align option for horizontal alignment - but that doesn't really help me for vertical alignment.