Plain paper cups
Colored masking tape
At your next casual gathering, set up a table with enough plain paper cups for all your guests, plus any or all of the supplies listed. Before partygoers get themselves a beverage, encourage them (or the kids) to get creative. They can paint a design with watercolors (which only take a few minutes to dry), make stripes with colorful tape, or write their names on labels. ID clear plastic cups with tape or labels.
With watercolors, plain matte office-supply cups yield the best results. (The paint won’t adhere to wax-coated ones.)
White cups, 35 cents each, thinkgarnish.com
Round kitchen labels, from $6 for 36, by Martha Stewart Home Office With Avery, staples.com
Classic removable labels with blue and green borders, from $3 for 18, by Martha Stewart Home Office With Avery, staples.com