We have a big wreath with red and white flowers that Mom bought three or four years ago, so we put that out around the end of June and leave it up for July 4 (actually it ill be there all summer). That's as "themed" as we get.
A flag on my front porch is the first thing that happens on the 4th. I used to do so much more but now it seems like time is going so fast and holidays are here and gone before I know it.