My Creations are not Zentangles

Im not too sure just what my patterns are called, guess they are just my doodling :).  My  first experience with what I do came about when I attended an Art and Design course more years ago than I care to think about.  We were given a collection of different items to draw a rough outline of and then fill with various patterns of our own devising.  Says a lot about my age that we drew in the patterns with a mapping pen with a nib and used black ink :)  Unfortunately I dont still have the piece as I loaned it to a Teacher friend as inspiration for her Art class lesson and sadly it was never returned.