DIY tent for kids - Make Your Own Fort Kit! This may be the best (and fastest) DIY gift for kids that I've seen. WHAT an awesome idea. cheap, great for imaginative kiddos, and can result in HOURS of play :)
"Build a Fort Kit" - Another Terrific Handmade Gift Idea for Kids
Fun for kids: DIY Fort Building Kit. Cool gift for a child. Includes 2 sheets, rope, flashlight & batteries, suction cups & clothes pins(for ties sewn onto corners of the sheets), & simple storage bag.