"Regenboogspiraal of Valkenburg aan de Geul" is a recently completed hostel for seriously ill children receiving treatment at the nearby clinic in the south of Holland. Their families can stay with them there, which is a wonderful thing if you're spending every waking hour with your child in a hospital. According to my rough computer translator, it also acts as a vacation destination for families with disabled children.
Friedensreich didn't live long enough to see his last artistic creation. He died back in 2000. Very Gaudí-esque, except instead of mosaic tiles, he uses paint.
Hundertwasser House is another building he did, a huge apartment building in Vienna. One source said it was for low-income housing, but I couldn't find verification of that. I just love how he's injected such joyful color into his designs. No depressing, lack-luster, regimented building structures here!