Gray has been aliased to grey more often than the other way around, so shouldn't all *gray* tags that aren't names be aliased to grey? I'm a fan of consistency.
This is the UK-english spelling, but more tag groups are dominated by the US-english spelling. Think of colour/color.
I'd prefer to see UK-english everywhere, but since more furs are from the USA than the UK, US-english will probably be used. I'd be fine with both, as long as the tags are consistent.
If you agree, also say if you prefer UK or US English please.
Updated by Xch3l