Sparrow Lockpicks sells a “sphere” that holds a standard lock core.  The idea is that the sphere gives the lock core some heft and makes it more ergonomic to hold it in your hand while picking the lock.  Originally it is designed to sit on a desktop with the lock displayed, but I thought it would be fun to  disguise it as  a bit of desktop art.

The lock core is now hidden and the base keeps it from dragging on the desk. 

Here is the link for the sphere device. 

https://www.sparrowslockpicks.com/products/the-sphere