In Morrowind I collected and placed skulls around my home (wherever I marked).
In Oblivion I just collect everything, I never sold anything unless it was enchanted armor I don't need. I always made sure to have one unenchanted version of every armor and weapon and a whole bunch of enchanted items, I liked collecting Nirnroot, I collected calipers for some reason as well... I have 378 calipers on my most recent character.
In Fallout 3 (off topic I know) I collected body parts from flesh bags and made bodies in my home out of two legs, two arms, a torso, four organs, and a skull.
CALIPERS FTW. What are calipers anyway.
Edit: Quote
I once filled the basemant of the Bruma house with nightshade. But before that I duplicated scrolls so I could duplicate more nightshade. My console almost blew up.
P.S. NEVER do that with Sigil Stones!
I did that with iron claymores, and then with sigil stones. I also duplicated 20k grand soul gems in Bruma. It lags really bad, but it looks like a fountain, lol. Inside of a house, I could literally not see anything, and it lagged so bad that it took me an hour to walk about five feet and turn about ninety degrees.
Speaking of claustrophobia...
Reminds me of the time I filled my house with watermelons in Oblivion (via console commands) to simulate my character's nightmare. Turns out that now he has a crippling fear of watermelons... These things happen.
Have you ever loaded up Midas magic and summoned a watermelon Atronach, lol.