I personally love the effect of fire or candles doing free style through the audience as it’s a nice chance to show off your technique up close and fire does bring the wow factor. If you do have the benefit of a big stage or center dance area I love starting or ending with choreography though just to bring it all together, if you have a short song you could even consider just having a planned ending pose that makes it look more polished.
This is just a few clips from a show last weekend. The choreo bit is what we did for the beginning and ending of the song and improv (not filmed) was inbetween. Fire we did all improv (short clip at the end) although we do have a full choreographed fire dance for stage shows where we don’t move between the audience at all which gives a very different effect.
Every show presents new challenges and new opportunities which is what keeps the dance so fresh.