Howdy Kevin,
Post those photos...
If you still have the prolapse issue and haven't already done so, try putting K-Y jelly on any exposed internal tissue to keep it from drying out. Swelling is another problem... This is an emergency but if you are unable to see a vet today then you may have to try to re-insert the organ that is outside in an attempt to save the tissue and your chameleon. It is equally possible to do additional damage while trying to re-insert the tissue... If no office vet is available maybe one will talk you through it on the phone. It may require a slender rod-like object that can be used to push the tissue back inside. If it is the colon, you will be turning it right-side in while it is being pushed in with the rod. It can be tricky but the alternative is that the exposed tissue will become damaged beyond saving and will need to be surgically removed. If you do get the organ returned inside, try wrapping the vent with something to keep it closed (maybe some kind of tape) until you can get to the vet at the next opportunity.
A friend of mine just went through this experience last month. What looked like the panther's colon was inside-out for about an inch. It had been exposed this way for more than 24 hours. A loooong story short, after a phone consultation with a vet, a rod was used to re-insert the organ. The vent was taped shut. Several days later the tape was removed and a day or two after that, some dead tissue was safely passed out of the vent. Amazingly, the panther seems to be doing fine and it's almost been a month since things originally went wrong. He's still not out of the woods yet. Time will tell...