The first pic looks like dust burning off of a night light bulb over a long period of time. I've seen something before that looked pretty similar.... although not quite as bad. It's kind of like when the dust burns on top of the bulbs on a bathroom light bar and leaves scorch marks on the ceiling if it's close.

The second pic looks like it's from those evaporating candles that were around a few years ago. I don't know whatever came of that type of candle but when they first came out with them there was quite a bit of problem. The candle would evaporate and stick to curtains, walls and everything else. This could also just be from something burning in the room (fireplace smoke sucking in, animal sacrifice, etc.).

I'm not 100% convinced on either one..... just kind of thinking out loud.