Total SVG files analyzed: 119158 (84706 current, 34452 old)
SVG files containing "<pattern": 1981 (1050 current, 931 old) SVG files containing "inkscape:stockid": 2594 (1246 current, 1348 old) However, they are mostly false positives. Just an arrow already sets a inkscape:stockid property. There're patterns that look ok, made from simple SVG shapes.
So I then centered on those containing the text 'texture provided'. There were 62 results (28 current), shown below:
http://upload.wikimedia.org/wikipedia/commons/7/7f/M1_Abrams_diagram_num.svg http://upload.wikimedia.org/wikipedia/commons/7/78/Baekryong_location.svg http://upload.wikimedia.org/wikipedia/commons/7/78/Pfeffersche_Zelle.svg http://upload.wikimedia.org/wikipedia/commons/7/7b/MultinationalForce-IraqDU... http://upload.wikimedia.org/wikipedia/commons/6/6d/ArrondissementsMarseille.... http://upload.wikimedia.org/wikipedia/commons/6/6a/Baarle-Nassau_-_Baarle-He... http://upload.wikimedia.org/wikipedia/commons/5/58/Baarle-Nassau_-_Baarle-He... http://upload.wikimedia.org/wikipedia/commons/9/9b/Clapboard.svg http://upload.wikimedia.org/wikipedia/commons/9/91/M1_Abrams-TUSK_hr.svg http://upload.wikimedia.org/wikipedia/commons/9/96/Distance-time_graph_examp... http://upload.wikimedia.org/wikipedia/commons/9/9f/Modele_eye_evolution_Nils... http://upload.wikimedia.org/wikipedia/commons/c/c0/Baarle-Nassau_-_Baarle-He... http://upload.wikimedia.org/wikipedia/commons/0/0f/Legion-esp-oro.svg http://upload.wikimedia.org/wikipedia/commons/3/3c/Baarle-Nassau_-_Baarle-He... http://upload.wikimedia.org/wikipedia/commons/3/34/Legion-esp.svg http://upload.wikimedia.org/wikipedia/commons/3/37/Harpsichord_jack.svg http://upload.wikimedia.org/wikipedia/commons/a/a9/Dinogetia_Garvani-_layout... http://upload.wikimedia.org/wikipedia/commons/1/1e/Nervous_system_organizati... http://upload.wikimedia.org/wikipedia/commons/1/15/MOSFET_Inv-Amp_quasi-line... http://upload.wikimedia.org/wikipedia/commons/8/82/Auzac_noir-blanc.svg http://upload.wikimedia.org/wikipedia/commons/d/dd/Auzac_noir_et_blanc.svg http://upload.wikimedia.org/wikipedia/commons/b/b3/Giro_lombardia_2008.svg http://upload.wikimedia.org/wikipedia/commons/4/42/Cacho_score.svg http://upload.wikimedia.org/wikipedia/commons/4/4a/Croquet_court.svg http://upload.wikimedia.org/wikipedia/commons/4/4b/Carte_de_l%27Yonne.svg http://upload.wikimedia.org/wikipedia/commons/2/22/M1_Abrams-TUSK.svg http://upload.wikimedia.org/wikipedia/commons/2/23/Ausrei%C3%83er.svg http://upload.wikimedia.org/wikipedia/commons/2/2f/Pa%C3%85ac_B%C3%83%C2%ADl... http://upload.wikimedia.org/wikipedia/commons/archive/c/c0/20080415130239!Ba... http://upload.wikimedia.org/wikipedia/commons/archive/9/9d/20071223173634!Er... http://upload.wikimedia.org/wikipedia/commons/archive/9/9d/20071223172538!Er... http://upload.wikimedia.org/wikipedia/commons/archive/9/9f/20081108152043!Mo... http://upload.wikimedia.org/wikipedia/commons/archive/2/23/20080317221713!Au... http://upload.wikimedia.org/wikipedia/commons/archive/2/23/20080316173247!Au... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080617195122!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080617191818!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080611145511!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080610114837!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080610113726!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080610112232!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080610063408!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080609190309!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080609174010!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080609171917!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080609155918!M1... http://upload.wikimedia.org/wikipedia/commons/archive/2/22/20080609155642!M1... http://upload.wikimedia.org/wikipedia/commons/archive/3/3c/20080415125943!Ba... http://upload.wikimedia.org/wikipedia/commons/archive/4/4b/20081022135013!Ca... http://upload.wikimedia.org/wikipedia/commons/archive/4/4b/20080820152318!Ca... http://upload.wikimedia.org/wikipedia/commons/archive/4/4a/20080805212421!Cr... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080829194207!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080803055021!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080802054218!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080801185330!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080801183415!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7b/20080801182909!Mu... http://upload.wikimedia.org/wikipedia/commons/archive/7/7f/20080618064851!M1... http://upload.wikimedia.org/wikipedia/commons/archive/7/7f/20080618060324!M1... http://upload.wikimedia.org/wikipedia/commons/archive/7/7f/20080617093633!M1... http://upload.wikimedia.org/wikipedia/commons/archive/7/78/20080713043930!Ba... http://upload.wikimedia.org/wikipedia/commons/archive/7/78/20080713010927!Ba... http://upload.wikimedia.org/wikipedia/commons/archive/7/78/20080319135013!Pf...
(some multibyte filenames may be wrong)
Now that we have a copy of commons, it can be used to gather more general statistics about our files, not just for format chasing. Which parameters may be appropiate?