When I was a kid I remember being a flower girl in a series of weddings. My Mom's very creative and crafty and we used to do the giveaways and other wedding accessories (i.e. table decor, entourage purses etc.). I was then exposed to going on trips to Divisoria, Quiapo and Baclaran to buy materials for our projects.
Going to Divisoria isn't difficult nor dangerous at all. We usually park at the 168 (mall) or during peak season we park along Reina Regente or sometimes nearby Binondo Church and then we walk. If you don't feel like bringing a car you can also take the FX from Taft avenue or the LRT 2 and get off at Recto then you can take the pedicab to Tabora. Just make sure you dress simply and just bring the essentials. Be alert as well.
You can purchase craft materials along Tabora street. You can buy at the street (make sure you haggle) or for those who are adventurous, try going inside the Yangco Market, there are a lot of craft stores inside. My favorite stores include "Good Morning" and "Morning Glory". That's where I buy materials for my craft projects. You also have the option to buy ready-made wedding giveaways. Prices go from PhP10 and up.
Some materials you can pick-up at the street are shotglasses, glass vases, mini-baskets and pouches. You can decorate the shotglass with a small flower and then have a sticker made at Robee Sticker with your name and wedding date. Glass vases can be filled-up with colored sand and customized with a ribbon with your names printed on a small card. You can also fill-up pouches with potpourri. For the crafty you can probably buy illustration board, some cloth and make frames! Ahhh, with all the available materials in Divi, there's so much you can do!