You can change these images to your own images. If you want the SDK images, you can download the SDK: http://help.arcgis.com/en/webapi/silverlight/help/index.html#/Sample_Interactive_SDK/01660000000v000000/.
This is related thread (see post# 6): http://forums.arcgis.com/threads/14852-Toolbar-icons-are-not-visible
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