Requirements:
-Druid
-Dual talent spec
-Balance spec (primary or secondary)
-Glyph of the stars Glyph of Stars - Item - World of Warcraft
First spec into balance. Then go into moonkin form. Make sure you do not have the glyph activated yet. Equip the glyph while in moonkin form, now cancel the moonkin buff. There you have it, you can switch to resto or another spec keeping the visual. Have fun tricking people that you are balance! This is canceled when you morph into another form like cat form or on logout.
Note: it only works on some servers, the one I tested it on is Pandawow. It might not work as it might be fixed on some servers.