My childhood dream of being Little Miss Moffat is now possible! Thanks to Japanese company Strapya, these nifty little Mushroom Stools are available for $13.50 (plus shipping and handling.) They come in four colors, Red, Pink, Blue and Brown. You can purchase one of your very own here. I'd need to carry this around everywhere with me if I ever manage to get to Japan. Sitting on my knees hurts like crazy.
EDIT (5-17-07) These were in Hana Yori Dango season 2! I bought one not long after I wrote these, and it's really fun. I was so excited to see something I own in a Japanse tv show.