Keep any additional decorations minimal and opt for those that mimic nature like these easy to make paper flower party streamers. Use the natural scenery or consider setting up a simple backdrop with fun props for a DIY photo booth that encourages guests to let loose, interact, and will produce a lasting memory of the event. 30+ DIY Outdoor Party Ideas and Entertaining Tips | DIY Please note: You are currently browsing img great idea for an outside birthday party for preschoolers that is 652x857px in size. This image is listed in diy garden party decoration ideas category. 30 DIY Outdoor Party Ideas and Entertaining Tips DIY, 652x857 in 133.70 KB.