There are two expansion packs that come with bonfires:
1. A bonfire that came with University, it's basically junky items that sims set on fire and dance around.
2. A bonfire that came with Bon Voyage, and it's more synonymous with a camp fire.
I have checked the wiki as well and have found no sign of a camp fire that is custom. The closest thing you will get to a custom bonfire is this open coals rotisserie by Phaenoh at MTS2. If you have university and don't want to use the junky bonfire, I'd suggest using the hang out option instead where they sit around it, somebody is cooking the hot dogs, you use moveObjects on cheat and move the person cooking somewhere else, and basically you'll have a bonfire-ish thing.