I was surprised how much features the newer versions of Mousepad have. One of them is the support for themes. And there is a very nice and popular colour scheme named solarized. Project website: http://ethanschoonover.com/solarized And someone made the files for gedit, which uses the same theme format as Mousepad. https://github.com/craig552uk/solarized-gedit/ With both the light and dark theme. The license is LGPGv2+.
@Moritz Val, Mousepad currently don't ship any theme by default. It simply picks whatever .xml is present in the /usr/share/gtksourceview-2.0/styles/ directory so I think (and I've already mailed Matthew Brush about this) that this bug should be filed against gtksourceview. I already filed the bug and attached the patch to solve it here[1], feel free to show up and support the request. [1]https://bugzilla.gnome.org/show_bug.cgi?id=706444
@Edoardo, wholeheartedly agree, and it was my thought when I read the bug mail initially, unfortunately I've been too busy to get around to responding. Thanks for opening the enhancement request upstream! @Moritz, once it gets upstream in GtkSourceView (presuming it does, I don't see why not), you'll just need to update that. Until then I guess you'll have to install yourself manually in GtkSourceView theme dir. Thanks for raising bug though, I agree they are nice themes (I even ported to Geany previously).
Upstream added the themes in https://git.gnome.org/browse/gtksourceview/commit/?id=2f40636405defbd14ffe9ecc91f18af5c5c9dd3f, even though it might not be useful for Mousepad until using gtksourceview-3.0 (didn't check if it was backported in older upstream versions).