homemade DIY indoor jungle gym - complete with monkey bars.Great for working on standing up and hand eye coordination. Not to mention, it keeps kids entertained on rainy days and will really come in handy during winter.
ceiling furniture means doesnt take up space on the floor, but then maybe you need high ceiling for it. plus not all owners will want cats jumping on them from up high and like OMG! get some yourself some pawtastic adorable cat apparel!