If you and your fiancé would prefer an oriental theme, you can choose to send intricate oriental invitations. If something more offbeat appeals to you both, send an anchor or pirate hat shaped invitation for a pirate themed wedding, or an old_world style invitation on parchment paper that looks like they have been hand written for a very traditionally themed wedding.
Is it acceptable to have a unique wedding invitation even if you are planning a traditional wedding? Absolutely. While some people like to coordinate their invitations with the style of their wedding, it is not strictly necessary. If you have a fun or different idea for your wedding invitations, then, by all means, choose the invitation that you want. If you plan on celebrating with a formal ceremony, make sure to mention that on the invitation, such as "black tie requested". On the other hand, if the wedding invitation is off_beat people may assume that your wedding will be a more casual affair unless you specifically state otherwise. Putting the information on the wedding invitation prevents any confusion.