MOM Tip: At your next party, set up a table with enough plain paper cups for all your guests and all the supplies needed to customize. Before party goers 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.
Plain paper cups
Colored masking tape
With watercolors, plain matte office-supply cups yield the best results. (The paint won’t adhere to wax-coated ones.)
This tip from Martha Stewart.