Yes you should definately start one. And you should add any old random crap, have it completely unstructured and difficult to navigate - then mine might not be the worst.

Best advice I can give is throw in a lot of 'reserved' empty posts so you can structure the start better and change it later - the readers won't mind a few 'nothing' posts

PS. Aim low, don't try to do too much with a showcase - once you lose the new thread thrill its hard to maintain the same level of content.