Fence planters can be quite versatile
Yes, besides hanging planters, or repurposing tin cans and plastic bottles as planters, there are many other things you can use as fence planters. For instance, you can use rain gutters or maybe some plastic bags. Choose to leave the gutters like that or maybe paint them in some vibrant color.
Planters can be hanged on different spots of the fence, or maybe you can choose one focal point where you can hang several of them or maybe a bigger one to make a statement.