Tillies don't need dirt, and that makes them soooo versatile when it comes to indoor display. As long as they have good air circulation and decent light, they're good. You need to be able to water them properly (mistings and soaks), so I don't recommend gluing them or pinning them to objects that cannot also be misted or soaked. My favorite way to display Tillandsias is on a CD rack. Now that CDs are virtually obsolete (very sad) you can find used CD racks of all kinds, cheap as chips.
At any rate, it's impossible not to have creative fun displaying your Tillandsia collection, so get going! Who's got some other creative ideas?