I have those rope things (sorry, I am drawing a blank on the name), fake leaves, hides, driftwoods and a hammock....Rocky enjoys the window like your beardies. In the smaller tank, Rocky loved the hammock (see profile picture- couldn't get him off of it) but has lost interest (in fairness, it's a new color). Every blue moon Rocky will try to climb the rope but the first two times I didn't secure it too well, but he didn't seem to mind.
OMG how did I forget, he has a swing too but that's simply for pouting!
So while I'm not too helpful, I too will follow this thread for ideas as well.