Speaking of the pot, you have a toilet right?
Look through The Corn Snake Manual... they're using a kitchen/toilet roll tube as a hide for a baby in that.
That's what I was using with my two hatchling Hypos til I went the Tampa show this weekend.. then I picked up a whole bunch of lil pieces of grape wood for $2 each.
I picked out every one he had that was small enough to fit in my 12qt tubs, and had a concave surface underneath that'd allow it to sit flat on the ground with an opening or two so the snake could crawl in under it.
That's what I'm using now in the tubs, but sure, go for a kitchen roll tube, or a big piece of slate or something (make sure it's something that can absorb warmth instead of deflecting it, that way if it's big enough, you can have one end of it warm and one end of it cool), then hold it up on some smaller stones, or pieces of wood so it forms a roof with somewhere they can crawl under.
Garden & landscaping centers are good places for rocks. We got some beauties for our beardies at our local place. The guys working there thought we were nuts going around and feeling each type of rock to see which held the most heat , lol. It was a pretty warm day around 95 or so, so anything that was nice n' toasty to our touch was good for the dragons.