Just an idea: Most icons have like a border (allmost same size even though they look different) so if you made that border same size but stylishly made some of the colour flow outside (like the icons were floating or moving) But just alittle bit outside so you could still line them up (with out them touching) if you wanted to do that. Perhaps border shouldnt be visible... more like mikec's example. Looking at theese again I'm starting to think theyre maybe too ordinary... Maybe if done with acrylics maybe with paint breaching the icon itself... hmm just brainstormin' here