The only problem I face is room. I use a small desk for work and hobby and I really cant afford the space to have lots of storage containers hanging around taking up space on what little room I have. I house my classic ink pads in a plastic crate which is shelved unless I am using them. So instead I have made use of a Tim Holtz tool. All the sponges connect to the ink tool via velcro so I went out and bought myself some dots and attached one to the back of the Ink pad. This way when I have finished inking I can just attach the sponge to the ink pad and I know where it is for next time.
With the sponges attached the ink pads dont sit perfectly but its a little price to pay in my individual case.
How do you organise your sponges etc??