HD7 with a Mondrian ROM? Or a Schubert ROM? ('Elephino... wait, that's not right.) Nothing too crazy, we imagine, but in doing so, xda-developers patron ansar.ath.gr has provided a proof of concept that custom ROMs can be implemented on Windows Phone 7 devices. In more technical terms, "this proves that the imgfs.bin can be used from any branded device to any other branded device." It's okay, you don't have to know what an imgfs.bin is, but if you're the sort who likes to tweak phones well beyond what's in the settings menu / user manual, just be patient and know there's at least a few brilliant coders who'll capitalize on this freshly laid groundwork.