Just put some jpg, png or gif files in your theme images folder. In this article we shown to set Media Icons in wordpress theme.

set Media Icons in wordpress theme

1. your_theme/images/audio.jpg
2. your_theme/images/audio.gif
3. your_theme/images/audio.png
4. your_theme/images/mpeg.jpg
5. your_theme/images/mpeg.gif
6. your_theme/images/mpeg.png
7. your_theme/images/audio_mpeg.jpg
8. your_theme/images/audio_mpeg.gif
9. your_theme/images/audio_mpeg.png

Whenever you are putting the media files in post above icons will appear in your theme.