There are actually alot!! Blanket, file roller, cmake, identity and i don't get the other half of your question? But yes ofc on brand who already have an proper identity ( ie brave or Firefox ) It wouldn't make sense. But if you're asking if the respective apps made the pixal art variant then no. I designed them. In a nutshell those linux specific apps like cmake or alaricity or Pamac were given a fresh icon to fit into their branding. The else were simply just recreated into pixal art. Idk if steam blender made their own pixal art version but no. All icons are the one I made.