If you wanted to try the firestarters, whether in a fireplace or a campfire, the idea is the same. You would use something to hold the wax and wood chips (ie muffin/cupcake paper cups or party paper cups). Pour the melted wax into the bottom of the cup over the wood chips (preferably not pine chips) and then add wick trimming. You can top it with decorative potpourri, birdseed, etc for looks. You can try without using a wick, but I had a hard time getting it to start properly without. When these burn, the idea is that the wax ignites and starts the fire. The wax will completely burn off. There will be no scent after the wax ignites - it will only smell good until you burn it. The dye from the wax will not change the color of the flames. In order to do that you have to use specific chemicals and the reaction from the chemicals and flames cause the color of the flames to change. So if you don't use pinecones or pine chips to make your firestarters, there should be no creosote buildup. The party paper cups are sturdier than the cupcake cups so the wax should not spill out (especially if it is level in the fireplace) and should be no mess. HTH