As Hopi said, they are in the image folder of the theme you are using.
All themes are in a folder called ColorThemes inside the resource data directory your Reaper uses. Reaper can help to find that directory: Options menu: "Show REAPR resource path in explorer/finder..."
Many themes (including the default) nowadays come as zipped files with the extension *ReaperThemeZip. Makes things a tad more difficult to explain (and tweak) but yields a bunch of advantages for the end user. They are ordinary zip files, technically, so you can open them with any unpacker application that can deal with zip (eg winRAR, or 7zip).
The Default theme files are in "Default_4.0.ReaperThemeZip". Unpack the zip and you find a folder called "Default_4.0_unpacked". That's the image folder of the default4.0 theme.
The names of the images you're interested in should all start with the word "transport". Eg transport_play.png is the play button.
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