My son is having his 6th birthday, and we had a Pokemon party last year which went really well.  This year he wants a Digimon party. My husband and I are going to build a cave using PVC pipes, cloth, and poly foam(looks like rock when painted)for the kids to find their digieggs. The eggs will be covered with sand and coffee grinds with a small digimon figurine hidden inside. We also plan to cut  the characters out of cardboard and have a ring toss-like in the digiworld, when the black ring catches a digimon it somehow changes their behavior. We hope it is a big success, our son is real excited and its in 3 weeks.