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I found how to change them with:
How to change ingame bars color:
1) go to League of Legends\Game\ and find HeroPak_client.zip
2) in HeroPak_client.zip go to DATA\Images\ and find healthbars.tga
3) unpack it into League of Legends\Game\DATA\Images\ folder (create if not exist)
4) open healthbars.tga with Photoshop \ Paint.NET or other tool that support editing .tga files
5) edit bar colors in your graphic editor and save this file..
But I cant even find the first file on the list