First post updated with link to (very unfinished!) demo
This is now available in the CDB: https://www.phpbb.com/customise/db/style/nosebleed3/
.bg2but they are used elsewhere too so if you change them check around your board to make sure everything else looks right
There is only one small change in the style, so 3.2.4 styles will still work in 3.2.5. The change adds a class to the text box in the contact us page so it styles correctly.