Personally I quite like the current theme however if the consensus is against it, here are some alternatives we might consider:
https://buddy.ghostpool.com/ <----Buddy theme http://preview.themeforest.net/item/onecommunity-buddypress-theme/full_screen_preview/3713046?ref=cirvitis
http://preview.themeforest.net/item/forum-a-responsive-theme-for-bbpress-plugin/full_screen_preview/20073313?_ga=2.153500984.1830900157.1554418716-172326474.1554418716
http://demo.strictthemes.com/?theme=Truemag
My current favorites are probably the first and last themes...