Sorry if this has been covered, I just can't make it work.

I'm trying to change some icons, I've successfully given transition control an icon (it didn't have one before) but I cant change the terminal icon.

I've backed up the old icon and uploaded my icon to '/usr/share/icons/hicolor/48x48/apps', rebooted, but no change.

Do I have to 'replace' the icon elsewhere too? ie scalable, 128 x 128 etc

Thanks