If indoors use emulsion Matt or silk depending on what finish you want.
Latex (water based paint) is generally used for the dining room or front room walls. Oil based paints are generally used in the kitchen and bathroom, but Latex paint has come such a long way you can even use it in both those rooms as well.
You should not paint a thermocouple.
Macadamia
You can paint on a photograph. Normal acrylic would work.
Preferably paint that has not already dried solid inside the paint can. I would highly recommend this type for most any use on an interior or exterior surface.
Acrylic wall paint you can buy at lowes or home depot.
You can paint your car blinkers with spray paint. You can use any type of Marine spray paint. The spray paint should be water resistant.
There are other wall coverings besides tile. Also, you could use larger floor tile to make the work easier. Maybe an exterior paint would work, but should you want to sell, the buyers would see this as a bad shortcut.
Oil Based
Paint is a noun when used to describe the stuff you slap on walls to change colors, and a verb when used to describe the action of slapping stuff on walls to change their colors. "Tom bought red PAINT (noun) to PAINT (verb) the walls with."
If you are painting your wall to project on to it, you could just use un-tinted white paint, but the results will be better with paint made for projection walls. Companies such as Goo Systems sell kits of primer and paint for the best results.
The best base paint to use before you paint your walls the color you want would be a water base paint since some people are allergic to latex. Also, a water base paint can be removed easier and doesn't interfere with the color you will be adding over it.