Below is an example of the layout I am trying to make for a beamer presentation: just a simple rounded black frame in which I could insert some contents (e.g. text or images).

I have looked at everything (block environment, fancybox package, ...) and I just cannot find a way to do it. If anyone has a suggestion, it would be great and much appreciated!

beamertheme you want to use, whether this is a plain frame (without title and head-/footline) etc.? – diabonas Mar 15 '12 at 21:22