I really enjoy sewing and am in the middle of putting together a portfolio to apply to get into a fashion subject at uni... I have decided that I would really like to bring back Hypercolor, but I cant find it anywhere!

Thermochromic fabric, which temporarily changes color when warmed by your skin, has been brought back by Dyenamic Infusion, which, in addition to a range of clothing, sells "Black Diamond" thermochromic-pigment-dyed fabric in the US for $30 a yard. The minimum order is 100 yards; for a smll project, you might do better to cut up some fabric from a shirt.

You can sometimes also buy thermochromic fabric paint in the UK from Ridgewell Press. The supply seems to be inconsistent. In addition, they sell fabric paint that changes color in response to ultraviolet light from the sun. At the moment they appear to have some Smart Phase heat-sensitive color-changing fabric. See the following article for more information on how thermochromic pigments work, and where to buy them: "Thermochromic pigment changes color when warm, and changes back again when cool".

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[An earlier version of this answer was first posted, by me, on Yahoo Answers, on August 7, 2008.]