How would you create a sunshine room?

Some days just have this awful ‘gloom’ about them. Most are a result of heavy clouds and rain, which to my mind makes everything appear grey, and dull. It really has a bad effect on me.

So I will light candles, burn incense and put an orange red lamp on. But more than that, if you had to create a sunshine room what would you put in it. Lights? paintings? and which kinds? Or what other things do you feel would steal away the gloominess?

I’d really love to hear your answers and also ones that could be used in practical life too.