I would propose, that we (mods) take theme suggestions via PMs and list them (we could add the new ones at the end of the previous PM and so on), so when we end a round, we can start the next one already.
Once the next is started, we have a couple days/weeks to watch, criticize and post our reviews of the shorts films.
So that way, one could suggest a theme but would never know when that theme will be released. I think it would be fair enough, allowing people to suggest themes that they'd like to work on while giving us a chance to move on quicker from a contest to another.
What do you think AJUK & Vishus?...and folks!?