I bought 2 sets of close-up micro lenses for the GH3 and GH2, I got a set for the 12-35mm lens and one set for the 14-140mm. They run around $10 on Ebay for the Vivitar screw on lenses, they are +1, +2, +4 and +10. I have used only the +10 so far. It lets you get about 3 inches away and get the whole object in the picture. Auto focus works also.
Here's is a closeup video and photo clip I did when I first got the lenses. Works also nice for closeups of table decorations/menus ect, at weddings and events.

Panasonic GH3 12-35mm lens with 10x close-up micro lens on Vimeo

I have a similar set of diopters in 58mm size... that one set works fine with the 12-35 and 14-140 using a stepdown ring for the 14-140 (but vignettes at the lens' widest... which is fine, because I don't use the diopters at wide angles)