There's been a lot of news lately about "paint-on solar panels"... in which the paint contains chemicals that can take the sunlight through an electron transfer process to create a current that can be collected and transmitted through wiring to provide electrical current.
This is a nifty concept--but as the researchers say, it's still being studied and has a long way to go before being viable for common domestic use.
You want another way to create a solar panel from the mere act of "painting it"?
--Get one or more wood or metal panels (4'X8' or other size)
--Get some flat-black paint
--Get some reflective silver paint or mylar film (with glue/sealant)
--Cut the wood/metal into easily liftable sizes
--Paint one side (and edges) of the wood/metal with the flat-black paint.
--Paint the other side with the reflective silver paint (or line it with the mylar)
--Let the contraption(s) dry and set.
During the day (when it's cold outside), lay the panels black-side-up in the sunlight hitting your floor near your southern exposure windows. The panels absorb some of the heat and then that heat transfers to the rest of your home.
Later, when the direct sunlight is no longer streaming into your windows, turn the panels over--the reflective side will still send some of that valuable light deeper into your home... negating the need for turning on light bulbs (incandescent, fluorescent, or otherwise --LEDs?--).
This is sort of a BASIC concept... but it works. And anything, and everything, is worth a try.