I don't know wether it is because I am an artist, but I find that doodling is so soothing. It can help you relax and can be done when under pressure, or simply just to pass the time. I do not do many Zentangles but I was at a loose end this week and had also agreed to swap a zentangle with an artist friend. SO...... here is the outcome. Couldn't decide which one I wanted to send so decided to send both. After all it's only art, and the recipient was pleased.
edit: BTW I have gone commercial, just reading up on Adsense and don't know what I have done but I seem to have got some Google adds on my postings. I have had a couple of adverts in the sidebar, etc for a while and was just tinkering with them - but I will let it stand and report on the income that this generates - so watch this space. I don't expect this will make me a millionaire overnight but fingers crossed, might be a few pennies in it. And talking of pennies I am hoping to start selling watercolours on Ebay / Etsy soon, will keep you informed about this also.