Another illusion question, on figments in particular. And yes, I've read the Skip Williams articles!
So, as per RAW, "figments cannot make something seem to be something else". To what extent does this affect a figment's ability to hide or conceal something/someone? I know you can't make a trap door seem like part of the floor, but you could create a rug that covers that part of the floor. And I know you could make an area of trees with a canopy of branches and leaves that conceals a party from say, a dragon flying above.
But, can you create a hollow figment that conceals one or more persons within? Such as, a large boulder, a carriage, the legs of a giant, or a suit of armor? One of my players argues that these examples don't alter the appearance of the PC (or PCs), so they should be allowed. I think the first two examples might be feasible, but the latter two seem to be a bit of a stretch.
Any thoughts to help clarify would be much appreciated!