Ball Claw - Awesome Sports Ball Holder by John Kurcheski, via Behance. Great for workout room to keep medicine balls off the ground. Or boys'/mens' sport balls (i. basketballs, volleyballs, soccer balls, etc.
Pillow room: don't spend money on couches or lounge chairs and buy a really nice movie screen. (This would be really fun for movie night, to just move all the living room furniture and bring out the pillows!
GENIUS…Line a pathway with rocks painted in glow in the dark paint. During the day they “charge” in the sun and in the evening they reflect the stored light. Rust-Oleum Glow in the Dark Brush-on Paint.