Here is a scan of a watercolour set from Natural Pigments. This is the rather lovely "18th Century Palette": (Click to enlarge!)
I have tested almost every watercolour paint in the Rublev line, and all have delightful textural properties. I use these paints mostly for small works or field sketches, as the paints are best applied and then left alone. Re-wetting them and brushing over them lifts them and destroys the texture.
(Update: 2013: Over time, some paints became unusable, and would no longer produce colour when re-wetted, even if soaked. Vivianite (Blue Ocher) was of much interest to me but is now just an inert lump which does not respond to water.)