Invitations, to me, are the first impression of what your party is going to be. With etsy you can buy a template for some very cute invitations and have as many as you want printed from walgreens, walmart, or any other picture printing service.
Plastic plates with super cute patterns are available at just about any store you go into these days. Some of the cutest patterns and shapes I've seen can be found at Hobby Lobby, Pier 1, and Target. They range from about $2-5 each.
Now if you are crafty like Anj, you can send home each of your guests with a custom made owl of their own. If it's within budget you can purchase them on etsy. Or, look in your paper for seamstress ads. The felt is super cheap and many of the seamstresses charge by the hour (or at least in KC they do) and you could have great favors for cheaper than you think.