To start of as easily as possible I have been drawing what I call pattern variations. I use a squared moleskine XL softcover notebook for this, so I can use the grid as a guide. I basically pick four colours of felt tip pens and I divide the page into several sections and try to make pleasing patterns with the same colours, so they are automatically colour coordinated. This is both very relaxing to do and gives quite interesting pages.
Here are some recent samples:
As you can see I like to write down the colours and brand of the pens I use so I can easily get the similar colour combinations in the future should I want to.
By doing these I am also slowly building a little personal library of possible patterns. I have all sorts of lofty ideas for artwork where I combine different patterns and these might come in very handy then as inspiration.
For now I'll just enjoy collecting these variations and taking it easy. I like art that relaxes me right now, without too many complications. :-)
Hope you have something simple that relaxes you when you need it and I wish you all a wonderful and artsy day!