Playing with art materials is a really good way to make oneself feel happy. Just throwing around blobs of watercolour, my favourite type of paint, on a lovely and clean bit of paper can be really fun and rewarding. Here are two activities for you to try if, for whatever reason, you are feeling a little blue.
Try painting these two simple patterns on a nice thick piece of cartridge paper. The patterns look (and are) really simple but you will have to slow down and be careful with your paint application. You will have to be strategic with which bits you paint when. It is a lot like a Sudoku but much more fun and colourful.