I just reset my caches. I love the new forum themes! The Halloween theme we got throughout October is awesome, and the new default theme boosts the site's tranquility.
I like it. I wish the pipes were a little brighter since they look too bluey and underground to me. The greens used at the bottom look more suited for a day theme in my opinion.
I mean, i liked the halloween theme but its really okay and fine i guess? i liked the SMW Bowser's fire and post game piranha plants. wished it was selectable since i liked it WAY better than the default option :P
EDIT: holy moly the new plain one looks incredible