From our friends at Buildfaith.org: Pray Outdoors with Chalk & more
"Many outdoor activities can be turned into prayers. Sidewalk chalk prayers at the church entry are a wonderful, visible reminder of children’s prayers and presence. Plastic landscape fencing can be used as a prayer loom and woven with sticks, ribbons or scraps of fabric. One of our favorite outdoor prayers is to blow bubbles after each person shares their prayers."
Doing a prayer walk can also be fulfilling! As you and your VBS class, summer Bible study group, or just you! - walk around your neighborhood, pray for the needs of the occupants of each house. As you look at the houses, you might see specific things to pray for such as a yard littered with toys probably means a busy family lives there, a home with a wheelchair ramp might have other needs to pray for... help your prayer partners to notice the surroundings and what might need prayers!