I realize I'm probably one of like 3 people who are still trying to include Bob's Mods in my personal mod pack, I understand if this is something you don't want to bother with.

Failed to load mods: The given sprite rectangle (left_top=0x0, right_bottom=64x64) is outside the actual sprite size (left_top=0x0, right_bottom=32x32).
If this is being used as an icon you may need to define the icon_size property.
See the log file for more information.: boblogistics/graphics/icons/inserter/blue-inserter.png

Thanks,
Urist

The problem is that Iridescent Industry is expecting a 64x64 icon, which seemed like a reasonable expectation because that is what the Factorio icons have been for a long time. However, the mod you're using still uses 32x32 icons. That is not something I'm interested in supporting.

I haven't tried it, so I don't know for sure, but maybe Artisanal Reskins includes 64x64 icons, which seems like it could solve this problem?

Well, I've been rocking Artisanal Reskins for a quite a while, I forgot I turned them off yesterday when I got the following error message.

Failed to load mods: IridescentIndustry/prototypes/cursed-furnace.lua:22: attempt to index field 'layers' (a nil value)
stack traceback:
IridescentIndustry/prototypes/cursed-furnace.lua:22: in main chunk
[C]: in function 'require'
IridescentIndustry/data.lua:130: in main chunk

Bob's mods are not (and probably won't ever) be officially supported, so your mileage may vary, but at least Iridescent Industry is able to load now.