However, you could use some general collective nouns that would fit, depending on the context:
* A grove of orange trees
* A basket of oranges
* A pile of oranges
* A heap of oranges
* A bowl of oranges
You could also be more creative and say:
* A burst of oranges
* A splash of oranges
* A sunshine of oranges
Ultimately, the best collective noun to use depends on the specific situation and the desired effect.