I bought a Richarm 0.45x Wide/Macro Lens Adapter and tested it with my GH2. Considering the price (47 euros including postage) I think the results are good! 
This is what it looks like:
Full size sample images (minimum focus distance)
Picture 1, With Macro
Picture 2, With Macro
Picture 3, Normal 14-42
Picture 4, With Wide
This is what it looks like:
Full size sample images (minimum focus distance)
Picture 1, With Macro
Picture 2, With Macro
Picture 3, Normal 14-42
Picture 4, With Wide
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