"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
Understanding the Importance of What Type of Speech One Could Use and What One Could Talk About on Shabbos;
Ear Plugs, Examples of Strengthening an Item on Shabbos, Hairspray, Stretching Shoes, etc.
putting thumbtacks into cork back board; brackets for window shades;