I'm itching to write but currently I can't think of any decent theme or plot that doesn't sound boring or over used. Any suggestions would be great.

Er... mebe you can just writhe your story as a first concept on a spontanious way, without care if the story becomes boring or full with over used events. Just writhe what you want. Than you read your first concept next day with a more critical mood. Each point you don't like it to read back, change you in a total opposite event you've written in the first concept.