I don't know whether to post this in the linux section or the windows section, sorry if it's in the wrong place.
I've noticed that the linux version of krita has a lot more themes than he windows version. The windows themes, though adequate, re kind of bland. There are one or two in the linux version that I really like so now to the point (finally.) Can the themes from krita linux be used with the Windows version and if so where are they stashed in Linux?

Those are the default KDE color themes. You can find them in /usr/share/kde4/apps/color-schemes .

Thanks.

Can more be installed, like in Gimp?

Oh yes, though not through Krita's gui, you need to copy them to the right place . They're simple text files, so you can create your own, too.