Theme

I've changed my mind at least a dozen times on what "theme" or colors I want for our wedding. At first I want an outdoor barn wedding with a rustic style and sunflowers galore. Then we found our now confirmed venue and changed to a "speakeasy"/roaring 20s theme. I went from maroon, to wanting light pinks and tans, to Navy, and now navy and gold. I want everything to look nice and to match but I'm struggling on deciding what would look nice. Especially when I start loo okk ikg at center piece ideas. I'm a huge fan of pinterest and have been saving ideas left and right. I know a lot of people think themed weddings are pointless but it fits the venue perfectly. My FH and I are both set on the theme but I'm having a hard time envisioning the set up. We are a year out and I'd like to start buying decorations and stuff while I can especially if I DIY but nothing has seemed to put me in awe yet. Any ideas or advice??