If you use a shallow saucer you might get a hummingbird to use it for a bath. The original site is in Swedish. Use a Dremel drill and diamond core drill, a bottle neck diamond core drill would be even better, see Eternal Tools for these.
Inventive Ways to Use IKEA's IVAR All Over the House
The IVAR system is, by design, modular and customizable — which makes it particularly fun to see all the ways it gets wrangled and reshaped by its buyers. It turns out there& a use for it in pretty much every room in the house.