An assortment of dithers. Not added directly because the value of a few of them is unlikely:
left-to-right, top-to-bottom:
replacement for 'advanced dither' -- which i'd call 'full dither'
jewel dither (unlikely)
scratch dither
alternate generic dither
pointy
(blank)
wavy
22.5 degree
vertical fade
amoeba
clustering dither (this has the maximum coherence of all dithers i've seen.)
diamonds
bubbles
(blanks)
Last time I checked, Neopaint only has two dither algorithyms. One of them is a generic one, the other looks oilpaint-ish ('clustered', it's called). I haven't successfully replicated it yet. 'bubbles' is closest in general appearance to it.