This bug has been reported here:
The SCIM menu icon is ugly, confusing and looks out of place. It should be replaced with a newer icon, but also one that represents what SCIM does (ie. a button with a foreign character on it).
Attached is a replacement for data/pixmaps which replaces:
The new icon is better, as it represent a button on a keyboard, but also has a foreign character on it, symbolizing what SCIM does.
Also attached is a patch which changes extras/setup/scim-setup.desktop.in to use the accessories-character-map icon from the gnome-icon-theme. It is better to use this, rather than the icon in data/pixmaps, because the icon can then resize if featured on a menu with icons larger than 32x32 (default).