(Melting ice.)
Other types of necessities (in conjunction with putting frozen liquids and warm areas): child, oneg Shabbos, etc.
improving the Ground through SOSSAIR, Carpet Removal, SOSSAIR in Conjunction with a Faucet Filter, and Anything Related to Kitchen Cabinets;
understanding the two views with "דרך לכלוך" (coloring destructively). (Wiping one's hands on a towel from grape juice, blood, pomegranate, colored ices, etc.);