I created a guide to sampling in Arnold with the help from my colleagues at Solid Angle.
It is also available in the following flavors – MtoA SitoA HtoA C4DtoA.
Thrilled to be nominated 2015 Autodesk AREA artist of the year. Many thanks to those who voted for me!
Here are some tests I did last year using the alShaders by Anders Langland. Please bear in mind that they are by no means complete and some of the attributes may have changed (especially alSurface).
alSurface alRemapColor alPattern alLayer alInputVector alHair alGaborNoise alFractal alFlowNoise alCurvature alCombine alCellNoise alBlackbody