How to draw an icon with rough background like that:
Is it possible to do this with some fill tool?
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An easy way to make line textures and cloth textures in Paint.NET is to draw many parallel lines and use Fragment. Draw vertical lines and fragment, then overlay horizontal lines on a separate layer and fragment those. Merge the two layers and shrink the texture.
I kept the pattern separate from the white background, then colored the lines and lowered alpha with Channel Ops plugin to get a close approximation to what you have above.