I'm very tempted to buy the Schwarzweisskeramik scuttle, but I'm the kind of person who can't help but try to make my own version.
So far I have a good working solution: Fill an insulated food server with hot water.
http://www.g-ray.co.uk/pictures/foodserver.JPG
Mix lather in an old bowl I found in a cupboard.
http://www.g-ray.co.uk/pictures/bowl.JPG
Put bowl into water in food server to keep it warm...
http://www.g-ray.co.uk/pictures/scuttle1.JPG
However, I have stumbled across what might be the perfect component of a home-made scuttle.
Behold the "posy vase/bowl"
http://www.g-ray.co.uk/pictures/posybowl1.jpg
http://www.g-ray.co.uk/pictures/posybowl2.jpg
Available from ebay in widths of 5" to 8" across, with a 2"-3" well in the middle suitable for holding a brush, aren't these things just ideal for putting on top of an appropriately sized bowl for making a scuttle?