This is a great thread, just what I was going to ask too, luckily I searched and found this first! Some really great information for a beginner gardener like myself!
There is a Birch Tree (Betula) which has a wonderful white bark - equally as striking as the silver and more unusual. many garden centres stock it and it comes in different names one of which is Jaquemontii. Here is a pic:
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Here is a pic: