Here's one simple but effective way to make title plates for your diorama. Only thing you would need is printable transparent foil and metallic paint. Finding foil isn't so simple task but it isn't impossible neither.
Design your plate (I suggest using MS Word). Parts that you plan in metallic color leave white. Flip your design horizontally to get mirror image (as can be seen on pic.2). When finished print your design on transparent foil.
Flip foil so printed part is on top. Cover transparent parts of design (I suggest whole design) with metallic paint. Probably you will need to paint in few layers since one layer of metallic paint is somewhat transparent too.
When paint dries flip the foil and cut your plates with hobby knife. Et voila, your plate is ready.
It looks even better in real life since effect of metallic paint is stronger than on photo.
Idea is not originally mine. I found it on Andrea Miniatures painting tutorial dvd. I hope you like it.