Diy Outdoor Party Decorations . You can spell out phrases like “oh, happy day,” “happy birthday,” or any other slogans suited for the event. Use striped paper for a few of the birds. 50 Outdoor Party Ideas You Should Try Out This Summer from www.homedit.com Cut out individual letters or decorate full pieces of paper or cardstock with themed elements. Easy diy decor ideas for backyard parties 41 best outdoor party decor ideas on 35 budget diy party decorations you ll 15 amazing diy party decorations for. One for the forks, one for the spoons and one for the knives.