I picked up a new Walsall pot today (not for this tree) and there was an almost violet purple with teal green through WS pot there also; im not sure it would suit this tree hahaha. Still tempted to buy it because i like crazy colour pots but can't really justify it already having picked up another WS pot.
I like with this one the elm is in that it almost 'vanishes' when you look at the tree as it picks up on the trunk colour so closely. My eye isn't drawn to it at all allowing to focus on the tree. At least with the white background that is the case. Might be more noticeable against a black background.