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I describe two novel techniques originally devised to select strongly lensedquasar candidates in wide-field surveys. The first relies on outlier selectionin optical and mid-infrared magnitude space; the second combines mid-infraredcolour selection with GAIA spatial resolution, to identify multiplets ofobjects with quasar-like colours. Both methods have already been appliedsuccessfully to the SDSS, ATLAS and DES footprints: besides recovering knownlenses from previous searches, they have led to new discoveries, includingquadruply lensed quasars, which are rare within the rare-object class of quasarlenses. As a serendipitous by-product, at least four candidate Galactic streamsin the South have been identified among foreground contaminants. There isconsiderable scope for tailoring the WISE-GAIA multiplet search to stellar-likeobjects, instead of quasar-like, and to automatically detect Galactic streams.

Quasar Lenses and Galactic Streams: Outlier Selection and GAIA Multiplet Detection