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Some notes on editing icons for the NWN style. Shouldn't need general/DM/Emote icons.

Existing Icons Info

Name	Rough Colour Codes	Notes
Feat Domain	7da8d1	White and black contrast White fading into blue Domains are similar although just a different more square design with a rounded black border and the background is two toned blue.
Spell	8b7486 (more drab) or 7c5574 To convert seems 3d2439 works well (61.4/35.8/57.2)	Similar contrast to feats Purple-ish colouring
Spell Scroll	White version applied to the scroll icon	This is the spell icon but made into a white form. Black is transparent.
Skill		Green similar to Good Effects
Good Effect	2dca25 or 45/201.6/37.5 when converting other icons with colorize	Project hasn't made these transparent (yet)
Bad Effect	Pure red for converting is fine	Project hasn't made these transparent (yet)
Class		Golden yellow

Colouring Icons

To edit a image to a certain colour first greyscale it (Colours → Desaturate → Mono Mixer).

Then a rough 60% opacity Burn use of the Fill tool. You set to foreground colour with the right colour option as per above. Tweak to fit.

Alternatively you can use the Colorize option although sometimes the blacks change excessively with using it.

Then add the border ala Overhaul Icon Drop Shadow Workflow after removing bits with the magic wand. This may be easier done when black and white. Remember you can add areas to the existing selected ones to do two separately coloured but still relevant areas.

To get a version with a black alpha layer export with no background colours and set the background colour in the selector to black. https://www.gimp-forum.net/Thread-Change-transparent-color-to-white

Making Icons Transparent

Some notes above - magic wand and so forth. This is also a potentially useful method from here:

Opened file with GIMP, Zoomed at it to see pixels better, Right-Clicked on Image, chose Layer, chose Transparency, Added Alpha Channel.
Then pressed Shift+O to choose pixels by color, clicked on darkest pixel I could find, and Deleted the dark area that cropped up. Selected by color another dark color pixel: if you think it'll still be too dark, remove the area again via Delete (and so on until you think they are transparent enough); if you want it to have a darker aura on the background, then stop at that.
Either way, chose the darkest pixels that you do not want to remove, then proceed to Filter, Blur, Gaussian Blur and see how blurry you'd like it to be (I opted to have both numbers by 2.00).
Save and use.

Spell Scrolls

This is based off only having a purple spell icon. For a new icon I'd expect there to be a suitably white source file used to generate it and the spell icon so they're identical.

Icon	Step Actions	Notes
	Start with normal icon (transparent of course since we have them already like this)
	Convert the purple icon to white, with Color → Desaturate → Colour to Grey
	Make all the black/grey left over into alpha with Color → Color to Alpha selecting the Color as pure black.
	Get the blank scroll background.	This was upscaled previously/separately: iit_scroll_001.png The colours of the original icon were not the same as the actual spell scroll icons so recreated it based off scrolls like Aid, Darkness and Summon Shadow with White to Alpha, then combining them, which was too dark, so did a tweak with Shadows - Highlights too with 30 more shadows setting or so. Looks reasonably approximate to the upscaled Bioware spell scroll backgrounds now. Also added border and cleared some transparency artefacts.
	Add the now white image to it. Note to make it fit better lowering the opacity of the layer with the scroll icon on it might be a good idea. At 60% it looks a bit better and more in line with the Bioware icons. 75% looks a bit more whiter too is probably fine. Might need to tweak a bit to look semi-similar. Some of the Bioware icons differ quite a bit in the "whiteness".	As a comparison here is the upscaled Bless spell scroll. Note the slightly different texture - evidently some tweaking may be needed for better results.