Before i started HHA Theme Challenge (for about 260,000 HHA interior points):
Upstairs: Full astro series, full guitar set, drum set, mic stand, wall-mounted speaker, amp, etc.
Center: Full orange stripe series, some plants, HHA gold trophy & plaque, some un-orderable items, etc.
Left: Full ruby Modern series, Flat-screen TV, aurora screen, black game shelf, etc.
Right: Full Lovely series, Papa panda, Mama panda, cassette player, homework set, mobile, ebony piano, music stand, rolling suitcase, birdcage, etc.
Back: Full brown minimalist, dessert case, wall fan, western fence, chaise lounge, yellow balloon, marshmallow chair, some un-orderable items, etc.
Basement: Full pink regal series, various unnecessary items, tools, some un-orderable items, etc.
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During HHA Trendy Theme Challenge (for about 1,270,000 HHA theme points):
Almost the same as before theme challenge, i only need to remove all non-trendy items and voila! More than 1,100,000 points the next morning! I had to completely remove all items inside Right Room though, since there were no trendy items at all.
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Now, i have all gold exterior for my mayor's house, and i'm still redecorating the interior freely without any theme / series restriction anymore. Temporary furniture i use in my house at the moment are:
Upstairs: some Gracie furniture, clothes, and 4 mannequins.
Center: Full cabana series, island & pirate items such as vintage telescope, Jolly Roger, life preserver, beach table, all HHA gold exclusive items, and 3 normal furnitures; hi-fi stereo, vintage telephone, & glass top table (forgot the actual name)
All other rooms: various items, tools, etc.
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If you don't believe me, you may visit my dream town anytime you want. The address is in my siggy. :3