Most of the time I don't really have a plan what to do with the zentangles afterwards - I start and only decide later.
To get the best drawing results I prefer to use slightly thicker paper (preferably watercolour paper as the micropen ink doesn't bleed on this paper) and various thickness of micropens. The doodle patterns can really be anything you can think of - geometrical, little flowers, twirls, white spaces .... and much more.
The following doodles are examples I created recently
random freehand doodle pattern
The size of the pattern is less than A6. It is drawn in a random fashion using two different micropens. After deciding to use the pattern on a card, I cut the pattern into inchies and arranged them on my card using Sharon's sketch for March
These are random patterns arranged in lines on a piece of scrap paper and cut into small strips of about 1.5 cm width. I wove the strips into a square and built a little frame with patterned paper around it
doodling within small stamped (or freehand drawn) outlines
These are small flower stamps from the Artistic Stamper which can be so quickly and easily filled with any pattern you fancy and which make great embellishments when cut out ...