We don't think these grinders would bug your customers very much, even if they are busy bees. 

4 part colorful painted aluminum grinder with unique bee or ladybug design. Colors will vary. Various sizes available.
Approximate diameter (42mm): 1.75"
Approximate diameter (50mm): 2"
Approximate diameter (63mm): 2.5"

MSRP (42mm): $5.99 - $9.99