I like them! Some remarks:

• The "line width" icon should probably have lines with different thicknesses that go in parallel with the bottom line so that the metaphor is clearer
• The "background selection" icon is still missing. There should be three icons: empty (plain white), checkered and lined. Try out the different options in the current development version to get an idea how it looks.

Everything else looks perfect, and I'd like to integrate these changes. Also, it would be helpful if you could provide these icons and the application icon as SVGs (if available) and PNGs, so I can easily integrate them into the application. The application icon would be needed in 40x40, 26x26 and SVG. The other icons should be the default size (48x48 IIRC). Thanks

Edit: Oh, and maybe replace the triangle with a free-hand line, as we can't do triangles, and this might be misleading.