That is one the things that voice in my head often will ask me. And usually it is when
I am staring at a blank paper or canvas. Now that I have shared that with you I will give you the latest answer I came up with. Grab a pencil, pick a spot in the room your in and do a quick sketch. If you are feeling brave do that sketch, but do not look at the paper you are drawing. Use very few lines just enough to capture the basic shapes of objects.
That sketch will be wild and strange, but that is good. That wild sketch will give you permission to go any where you want with it. It is not perfect to start with so you do not have worry about a perfect painting. (Love that line; think I will read it one more time just for a smile.)
Now grab about 3 colors, and make one decision do I want a warm or cool feeling.
If it is warm use two warm colors like red and yellow and one cool like a blue.
If it is cool use say, blue and purple with an orange. Throw in a black to help deepen some colors if you are using watercolor. If you are using acrylics also add white.
Paint the majority of the painting with the first two colors saving the last one just to highlight or add some spark to the picture at the every end.
This is fun and practice but also can be an amazing painting when you are finished.
Give it a try and see what happens.
By the way the pictures are from my bed room and my living room. And yes messing rooms are more fun to paint, now a reason to avoid house work...life really is good.