The very best ideas are the ones that seem so simple and straightforward that you can't believe someone hasn't thought of it already. That's how I felt when I encountered Moonish tiles at ICFF this year. Beautifully silkscreened plywood tiles are outfitted with a magnetic backing that allows for easy, nonpermanent installation on walls. Each tile has an adhesive steel strip, meaning you can rotate and rearrange the tiles in an endless variety of patterns.
Speaking of patterns, there are some gorgeous ones available. It's an elegant alternative to stenciling or installing tiles. Plus, you can take them with you when you move! Voilà.