I once took a photo of my tension tools:
yep, they are loads - most made of the spring in windscreen wipers. Some from streetsweeper bristle, some from allen wrenches.
Short and long blades, short and long handles some made specially for one kind of lock (I carry arond some windscreen wiper blades for that purpose).
The small thing with the rubber band is a mini-flipper - works and is dead cheap
Cheers,
reg